Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac338e07cd7ba3c…

MALICIOUS

PDF

47.4 KB Created: 2020-11-06 15:03:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a380ed8bd1dd19045d25b7c98d6cc5d2 SHA-1: dcb7a7443d8135bd2d2b60e11cce885a8c45b7e9 SHA-256: 1ac338e07cd7ba3ce4ab3f580422aa949a5477bc0cec9ec1970a56310092d4fe
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/123?keyword=chrome+older+versions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404488/normal_5f9d8a219371c.pdfIn PDF document text
    • https://roxunasof.weebly.com/uploads/1/3/4/3/134312726/4b50a355e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_5f87e3b58242b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459466/normal_5fa252ef823d3.pdfIn PDF document text
    • https://kutepazibug.weebly.com/uploads/1/3/4/4/134477769/169917.pdfIn PDF document text
    • https://malebikixolu.weebly.com/uploads/1/3/4/3/134358595/9162801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367303/normal_5f99fab90931b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408584/normal_5fa44b995d303.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_5f9249d032a83.pdfIn PDF document text
    • https://tukibasitotaz.weebly.com/uploads/1/3/4/4/134445351/tulawuzemuzixub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391314/normal_5f9fdfcda4e6e.pdfIn PDF document text
    • https://pasabegimukug.weebly.com/uploads/1/3/4/2/134265340/gafol.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/676b5567-9a18-4282-afbd-f340a61b4e44/30406701708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b1adba0-c62d-446d-8ad2-5d06c52c9035/rubatosijanuzefugibuje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0767/8915/files/nitro_5_an515-51.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3084/6881/files/bowling_green_r1_lockdown.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7280 4820 bytes
SHA-256: e8c463f53e8dd2c3111fa8afce8dc378cfb9d0c89ff3327af0b69b508c4b45ba
font_01_sfnt_off000082ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82AD 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00008b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B3B 10916 bytes
SHA-256: 6ea8b28e29231564d9342ee0364a350a211d2394f7106c7cbd38d0e9d2e18250

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