Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fcf44cf8785541c…

MALICIOUS

PDF

41.0 KB Created: 2020-08-14 09:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 889ce912439a4cb7ea1c6c6d73f31a93 SHA-1: 6dfc76dd42a1209ea90e12ee15531c1cc86e232c SHA-256: 5fcf44cf8785541c1cd54324ee0e42c204e00698c3629d63decc8caa36280e25
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure known to host malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure itself is designed to appear as a link farm. The primary IOC is the redirector URL, which is likely used to funnel victims to malicious payloads.

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 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.
  • 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/wb?keyword=mass%20spectroscopy%20pogil%20pdf
    • http://files.ftfconsult.com/uploads/1/3/1/4/131406610/27b5f.pdf
    • http://files.rangersafc.co.nz/uploads/1/3/2/6/132681836/1fe2a7c1b.pdf
    • http://files.estudiosdelaescritura.org/uploads/1/3/1/8/131856283/e2a1d9df78d0cd4.pdf
    • http://files.jacquelinesalvador.com/uploads/1/3/0/8/130815437/7922258.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1561/7182/files/sevobarejaxipikafumivezo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/bizaropufinuroxilejigob.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/54557307420.pdf
    • https://cdn.shopify.com/s/files/1/0438/4541/9165/files/readings_in_ancient_greek_philosophy_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/2306/4488/files/electrostatic_boundary_conditions.pdf
    • https://cdn.shopify.com/s/files/1/0428/7728/8611/files/bimuxepasozufazol.pdf
    • https://cdn.shopify.com/s/files/1/0435/6295/9006/files/pogaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/0512/4516/files/selulowupipixuru.pdf
    • https://cdn.shopify.com/s/files/1/0435/0178/1158/files/pojidadegovulebosumere.pdf
    • https://cdn.shopify.com/s/files/1/0429/3237/1622/files/74654318431.pdf
    • https://cdn.shopify.com/s/files/1/0450/6717/4040/files/monthly_calendar_december_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/6700/7386/files/who_s_afraid_of_virginia_woolf_screenplay.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006084.bin
579f1f59659fa55a0835a5b3ac8c96089c4e41b9e8176cb1839dbd7d45b21954		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6084 5432 bytes
font_01_sfnt_off00007316.bin
e280f28cfda5401954ca4971a958cf7cda709420db8cb2fcba1b02fabeb0a793		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7316 10468 bytes

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