Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a26ffc681185e83…

MALICIOUS

PDF

48.7 KB Created: 2020-08-11 20:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e42341d8669da6ac5e7ac0e5eb373329 SHA-1: 8e6f07914c569285886810100f7413c1b91a9b4d SHA-256: 7a26ffc681185e8357f21867a154a834d2b30aa9365084cdcb7c402cf8e0ad0c
154 Risk Score

Malware Insights

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

This PDF file contains a link farm designed to appear as a legitimate download source for PDF books, but the primary link redirects to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the PDF structure includes numerous links to external PDF files, suggesting a SEO poisoning or link farm tactic. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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=alta+fidelidade+livro+pdf+download
    • http://files.homelesshaventv.com/uploads/1/3/0/8/130874102/47a2151b05eff.pdf
    • http://zuxekiwe.bobbebold.com/uploads/1/3/0/8/130814237/fokudewemole.pdf
    • http://files.sparxelectricalcontractors.com/uploads/1/3/2/6/132695586/8127574.pdf
    • http://files.sfabsm.org/uploads/1/3/1/3/131383583/tesoruta.pdf
    • http://files.stoprethinkspeak.org/uploads/1/3/0/7/130775998/4933628.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3467/3305/files/11941095774.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/suton.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/muzubi.pdf
    • https://cdn.shopify.com/s/files/1/0439/4457/5131/files/57630203815.pdf
    • https://cdn.shopify.com/s/files/1/0431/5290/0260/files/bravos_tulsa_menu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77330784460.pdf
    • https://cdn.shopify.com/s/files/1/0435/6482/6783/files/akmn_beden_dili.pdf
    • https://cdn.shopify.com/s/files/1/0430/3332/9817/files/puwunutibodilaramevoke.pdf
    • https://cdn.shopify.com/s/files/1/0433/9911/9013/files/77220516167.pdf
    • https://cdn.shopify.com/s/files/1/0450/8683/4851/files/pozum.pdf
    • https://cdn.shopify.com/s/files/1/0438/0013/3793/files/42247728833.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007642.bin
d16ec312b529d5aeed36d126230986cf3910e9d11558a5fa61ba94565bc700c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7642 1960 bytes
font_01_sfnt_off00007f74.bin
53a241fbe77bebede004bcb70709ccce17fbec163b8aabc81f89ead157404b56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F74 5000 bytes
font_02_sfnt_off00009099.bin
9b0ac0076ebd8f0d5875250c603d7fecff8f61aa298f6f8ed5a539456173d45e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9099 10892 bytes

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