Malicious PDF — malware analysis report

Static analysis result for SHA-256 122b00c403ebc1b9…

MALICIOUS

PDF

50.3 KB Created: 2020-08-14 19:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15c0f396732ad6cb6b190596b17acc1e SHA-1: a07942b9ddef6fd8393eaff62e264e8d790dd99b SHA-256: 122b00c403ebc1b95011cbd1fcdb3befac27ed1f4621647ed6543ccaaa9506f2
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. One prominent link, 'https://ttraff.cc/pify?keyword=report+non-+gaap+eps', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous links and the malicious redirector indicate an attempt to lead the user to harmful content.

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=report+non-+gaap+eps
    • http://berubi.innovationtoursgreece.com/uploads/1/3/1/3/131380158/0a67de0d.pdf
    • http://files.international-mini-mba.org/uploads/1/3/1/3/131398177/xofawixedoga.pdf
    • http://files.bijouxblues.com/uploads/1/3/1/4/131437689/gizegafox.pdf
    • http://files.lordsburg.com/uploads/1/3/1/6/131606353/522424.pdf
    • http://files.discoveringthecreativeimpulse.com/uploads/1/3/2/3/132303230/legakumo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jedufejaselikaruratemop.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42820491308.pdf
    • https://cdn.shopify.com/s/files/1/0431/4021/9037/files/nowexojidumiwavito.pdf
    • https://cdn.shopify.com/s/files/1/0431/9287/7217/files/45879978624.pdf
    • https://cdn.shopify.com/s/files/1/0439/4654/1211/files/benzoin_reaction.pdf
    • https://cdn.shopify.com/s/files/1/0435/2966/6724/files/dungeons_and_dragons_manual_del_jugador_5.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fimovubonivunab.pdf
    • https://cdn.shopify.com/s/files/1/0427/8157/3279/files/zizefoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dobemajafapurotexujebo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/detailed_lesson_plan_in_filipino_grade_9.pdf
    • https://cdn.shopify.com/s/files/1/0437/8954/9729/files/auxetic_metamaterials_and_structures_a_review.pdf
    • https://cdn.shopify.com/s/files/1/0434/1887/8114/files/mass_of_creation_memorial_acclamation.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_off0000884f.bin
64c7530255f218e8e916a933044265aeb7b343a3aa73fdaab15752a557ff7178		 pdf-font-stream PDF embedded font (sfnt) at offset 0x884F 4996 bytes
font_01_sfnt_off0000996b.bin
03780c00263fe9221a7f87a02cf0183260c4f8c452bacf70223a52fca4e1920d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x996B 10304 bytes

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