Malicious PDF — malware analysis report

Static analysis result for SHA-256 1553408ff0f2e4e8…

MALICIOUS

PDF

43.0 KB Created: 2020-08-03 22:39:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 461b20079fee3ebc0da323cf34c9af7b SHA-1: c82694bef4c7458a1c186537fb7c793a5b52dd03 SHA-256: 1553408ff0f2e4e8ca4119d6613cb5f88477d41d3b3a431d6bb324d2a72d842c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics and IOCs. The PDF also hosts a large number of external links, suggesting a link farm for SEO manipulation or to distribute malicious content. No scripts were extracted, but the presence of malicious links indicates a phishing or redirection attack.

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.com/pify?keyword=ielts+listening+test+with+answers+pdf
    • http://files.shaktishalayogaguernsey.com/uploads/1/3/1/4/131410012/solidejugamuwo-gagiperew-ridelawir.pdf
    • http://files.bryaneconnellpsych.com/uploads/1/3/1/1/131164425/kipamagiwizigi.pdf
    • http://files.kerrymolina.com/uploads/1/3/1/4/131452929/filekaxoro_mowebafavideja_wupot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/94812109240.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/27538736140.pdf
    • https://cdn.shopify.com/s/files/1/0436/1139/0115/files/doxoforedugirugu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1733/1100/files/tasolisasamipaxegopewe.pdf
    • https://cdn.shopify.com/s/files/1/0430/3178/9721/files/solving_equations_8th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0437/6834/8830/files/97141262457.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/93348254567.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/dotijuzunakupatakometu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6645/8265/files/763527406.pdf
    • https://cdn.shopify.com/s/files/1/0440/1335/5166/files/32466290388.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1278/files/53404684086.pdf
    • https://cdn.shopify.com/s/files/1/0443/8307/6518/files/camry_manual_transmission.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/70100661401.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_off000069c5.bin
f150f3fd4c1d220f0b6a49c0a3d94a763637361c17c41051ffd1ed5d1d26694e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69C5 5332 bytes
font_01_sfnt_off00007bf5.bin
14326da9bd55499566db742ab5c8315a76ac6665b1fbb704b8da3e243652607f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF5 10392 bytes

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