Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a7ab9d7cd464a6…

MALICIOUS

PDF

51.1 KB Created: 2020-10-15 15:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f3b15a5550570bdb4952cd09a2380852 SHA-1: d4cc8337c805f5942c804e64976270a996e98701 SHA-256: 28a7ab9d7cd464a68bad08f3273af987f4a1d5b74667868d6eb18ba6c3497ecd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to disposable hosting services, indicating a link farm. One prominent URL, https://gettraff.ru/strik?keyword=shining+nikki+3d+apk+download, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document's primary purpose is to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/strik?keyword=shining+nikki+3d+apk+download In PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/xekena.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/saxajibuvatutuk_fakilerani.pdfIn PDF document text
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/wiwakop.pdfIn PDF document text
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/2211748.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/4733702.pdfIn PDF document text
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/lolazawake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_5f874c6994e6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f8705c80543d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d8b5df7-2cdc-4172-9e42-844c6755b413/15372731700.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/035e570c-0ff5-43ac-9bf9-16e9b78e02de/17833356532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e4867ee-69d8-49ee-a1ca-3928da5f2695/9185255891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/effe6820-bc48-453e-b77b-0c0e75f47a97/janeduj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aa19b55-923f-408b-91ec-72866a1793c8/77023084645.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb3bdece-54ea-4cf0-ae5a-11037d073c82/67557740135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fa22839-dd48-4be8-a224-4491d0bf08ec/50712576438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebb3e099-1773-4978-9892-209f258299ae/30259622577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a837a585-754f-4163-8615-16cb3bfb9d73/fovewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e319f49c-3688-4620-9192-e22695a9c370/tifogusisiwukor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa4e6083-d92b-40d3-9473-0af028303cb4/vaxolazofufipigufude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9414e972-1902-4463-8524-8a4b8ff9f636/gaposezekusadalerom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c93f5d68-c9d3-454c-b27d-4536ca6466d3/banoluluv.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5068 10676 bytes
SHA-256: 3ceac1cf912c4d7378a89f47edb6345a61a2704d56a3b70e9c057a9933817a1a
font_01_sfnt_off000073b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73B4 5368 bytes
SHA-256: e56fa371acc682e079e18b20c6cdb4199b2c505629fdd0b82ff46c898a07a9cf
font_02_sfnt_off000085ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85FF 9680 bytes
SHA-256: 139c34a96bee677e53ecfe3f50b4111d6de0082760ac60ec94620e316b25cc53
font_03_sfnt_off0000a755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA755 16248 bytes
SHA-256: 9e020c854edd9d16e76d4d276d806d6ad9537766fc0f49e31c6b0dee74960295

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