Malicious PDF — malware analysis report

Static analysis result for SHA-256 108acfa77989a11e…

MALICIOUS

PDF

43.2 KB Created: 2020-08-13 07:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a533c004f1d18e0cd3ee908037dbfedf SHA-1: b2ddf77af8e6e4a0f68773e7075fb4c77580a215 SHA-256: 108acfa77989a11ee5c4dec177311a1b36fbad4c967091492e90b5861435cd31
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a tactic to distribute malicious content or engage in SEO manipulation for phishing. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=tb6600%20stepper%20motor%20driver%20controller%20pdf
    • http://files.barneyhourihane.com/uploads/1/3/0/7/130776069/453215c4fc.pdf
    • http://files.abqmobilenotary.com/uploads/1/3/1/4/131454950/tevas.pdf
    • http://files.nativeng.com/uploads/1/3/2/7/132740564/xetudiw.pdf
    • http://zipes.upperlonglakeestates.com/uploads/1/3/0/7/130738524/nexojukufaguzulega.pdf
    • http://files.handmadebyluluke.com/uploads/1/3/2/7/132740467/60dc3855.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7974/6207/files/89024485504.pdf
    • https://cdn.shopify.com/s/files/1/0431/4329/9232/files/58706144341.pdf
    • https://cdn.shopify.com/s/files/1/0434/3437/7377/files/dijifora.pdf
    • https://cdn.shopify.com/s/files/1/0435/6312/2843/files/60773318363.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/konosodogexasugiri.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2290/files/rumudamiwolosubajoz.pdf
    • https://cdn.shopify.com/s/files/1/0447/6128/4757/files/ll_cool_j_house.pdf
    • https://cdn.shopify.com/s/files/1/0446/7766/0825/files/jurnal_akuntansi_biaya_syariah.pdf
    • https://cdn.shopify.com/s/files/1/0428/2990/6079/files/lazuzosaluverevanu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9313/9357/files/google_interview_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/0620/5857/files/madoka_magica_episode_1.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1019/files/vapofafaxerabunotoxepaz.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_off000068ab.bin
e47accdd2e61f1608becee2219c391c1b4b06eb43b7aa6418d65f765745cdf67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68AB 5536 bytes
font_01_sfnt_off00007b65.bin
e144ad1658a1fd3bcb8629cd1c58e0a9fb541fb136bd3f99ab8866d4c3fe34b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B65 10728 bytes

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