Malicious PDF — malware analysis report

Static analysis result for SHA-256 021b41700ea3f5e9…

MALICIOUS

PDF

48.2 KB Created: 2020-08-28 01:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca3c710a59b9623895f84b221e1958cf SHA-1: 3f040d44accfe9dcf5217629e02cd1da34f5fd5d SHA-256: 021b41700ea3f5e9cce8f6f4e1d82379a22fabca65549b0baee6be9986d1561a
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=metodos+de+conserva%25C3%25A7%25C3%25A3o+de+alimentos+esteriliza%25C3%25A7%25C3%25A3o`. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous external links, one of which is `https://cdn.shopify.com/s/files/1/0434/2841/3607/files/patient._co._uk_gout_diet_sheet.pdf`. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains text related to food preservation and the wkhtmltopdf tool, suggesting a lure to disguise the 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.cc/pify?keyword=metodos+de+conserva%25C3%25A7%25C3%25A3o+de+alimentos+esteriliza%25C3%25A7%25C3%25A3o
    • http://jowuso.bereczkei.hu/uploads/1/3/1/4/131438464/9474301.pdf
    • http://files.marinacoveconsulting.com/uploads/1/3/0/9/130969790/9362066.pdf
    • http://files.theoriginalfish4ideas.com/uploads/1/3/1/4/131411596/1072996.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/2841/3607/files/patient._co._uk_gout_diet_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0439/files/gajemunujusegesozikivikib.pdf
    • https://cdn.shopify.com/s/files/1/0439/0364/7912/files/set_timer_for_14_minutes.pdf
    • https://cdn.shopify.com/s/files/1/0431/8458/6903/files/linux_shell_commands_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/6734/1974/files/safusolukurewasal.pdf
    • https://cdn.shopify.com/s/files/1/0433/6943/1189/files/artificial_intelligence_and_machine_learning_for_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0461/9131/3059/files/privacy_policy_template_uk.pdf
    • https://cdn.shopify.com/s/files/1/0435/6472/8479/files/abstract_of_payment_of_bonus_act_1965.pdf
    • https://cdn.shopify.com/s/files/1/0429/4197/2646/files/73793502293.pdf
    • https://cdn.shopify.com/s/files/1/0448/2557/5581/files/phrasal_verbs_dictionary_cambridge.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/kopifil.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_off00006bfa.bin
3013897e8319609316182d07e1f088575e3cdf1d2b985af9668ee5db5368d542		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFA 5488 bytes
font_01_sfnt_off00007dba.bin
f3b40909354c65f7ac40bf1090df1cdbd5a43d4886e35411a5c34bd5a56c4ac5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DBA 12360 bytes
font_02_sfnt_off0000a2e3.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2E3 4324 bytes

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