Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe8abbcc50f22b0…

MALICIOUS

PDF

42.9 KB Created: 2020-08-18 19:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98401abceee3d4c7a638f23574f0b201 SHA-1: a9aceb081c395b7b652ad0e9fec955925c42b952 SHA-256: 5fe8abbcc50f22b05affeb48a77a107c1477708ad7cca23072c344b73c557cb2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a pattern of link manipulation, likely to drive traffic to malicious sites or for SEO spam. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector suggests an attempt to lead the user to a compromised site or phishing page.

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.cc/pify?keyword=2000+bayliner+trophy+2052+manual
    • http://files.cprfun.com/uploads/1/3/0/7/130776462/44f6ebb15997.pdf
    • http://xopopiba.zanefix.com/uploads/1/3/0/7/130738943/kegaranolazepop-jeturefesejoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/39784214534.pdf
    • https://cdn.shopify.com/s/files/1/0437/7473/8593/files/82511395868.pdf
    • https://cdn.shopify.com/s/files/1/0432/1565/0980/files/sugobotanenikeresetefani.pdf
    • https://cdn.shopify.com/s/files/1/0432/1764/9819/files/bejomaleb.pdf
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/kepulejakitepawiko.pdf
    • https://cdn.shopify.com/s/files/1/0429/1143/2857/files/87693875219.pdf
    • https://cdn.shopify.com/s/files/1/0429/9902/1717/files/fusopavutiwomet.pdf
    • https://cdn.shopify.com/s/files/1/0439/0223/8875/files/accidente_cerebrovascular_minsal.pdf
    • https://cdn.shopify.com/s/files/1/0439/3412/2139/files/36891514863.pdf
    • https://cdn.shopify.com/s/files/1/0437/4259/3189/files/speaking_in_cod_tongues.pdf
    • https://cdn.shopify.com/s/files/1/0439/1760/7067/files/beep_song_in_mass_tamilan.pdf
    • https://cdn.shopify.com/s/files/1/0435/8746/9469/files/anamnesis_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/5498/9466/files/taguxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4546/1909/files/guardian_rank_borderlands_3.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_off00005db6.bin
ebbfe20f63e2cd38bc8e0759702a1060d008c1a379ba6b25783b20980d362c6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB6 5428 bytes
font_01_sfnt_off00006ff4.bin
142dc442ca277f56856c94c56e7fe59d0bb9717f8f30d6afb5214b3ec6761d41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF4 15336 bytes

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