Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b0ea1056a3044c…

MALICIOUS

PDF

56.0 KB Created: 2020-11-02 10:20:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bc6b265641bb9e1ffde3a6d5efaab391 SHA-1: 9e2ce7753a52d41f67a6d2c7b289a1319a2787b0 SHA-256: a7b0ea1056a3044c43e620ab4077a65ea3046897f1d630d73e86b13038dba312
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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://ttraff.ru/123?keyword=pfaltzgraff+tea+rose+serving+bowl+10+pasta In PDF document text
    • https://kobizixudowizeb.weebly.com/uploads/1/3/4/4/134402546/4507062.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/e21dba4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_5f965fd7d18ae.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/79e9db019e8.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/rinefaz-movovilepokotig.pdfIn PDF document text
    • https://nosadipopone.weebly.com/uploads/1/3/4/4/134470180/dunawu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383695/normal_5f9673e211f22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402710/normal_5f9a934a69f27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453550/normal_5f9f605459831.pdfIn PDF document text
    • https://wejibuxod.weebly.com/uploads/1/3/0/7/130740202/xukasedu-lulapa-rujojukupisi-tumikofilib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382430/normal_5f9331ae3882a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f8a989837b85.pdfIn PDF document text
    • https://dujopoda.weebly.com/uploads/1/3/0/7/130739119/tojibit-kifigebelanowe-nowepetim-ronusilejukogaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371790/normal_5f8fd20d56857.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2880/5789/files/pipuf.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000080d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x80D7 14828 bytes
SHA-256: 35b16f6c51209cf9338cded60838546402aa232d5b9b32407e29a42277f74a4a
font_00_sfnt_off00006d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D93 5604 bytes
SHA-256: e1a25a96912410fc8b00c03d8c21996ac3e62d2bf97199bcb992b031977224a4
font_02_sfnt_off0000a9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9AF 11544 bytes
SHA-256: e3640957699915dd138b7877eefaceed9bc9cb2d46675460c5f1dba233c43628

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