Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4a6e18e2e28391…

MALICIOUS

PDF

50.9 KB Created: 2020-08-08 16:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f623eb2da09e3116927818a1da5001a SHA-1: ceb302b3d0e8f5729d567e6380ea6d9bfd07e952 SHA-256: 5c4a6e18e2e2839148edbc0da3b6627ae35001cc7fbac65b342dc869edca2f1d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body itself is heavily obfuscated but contains URLs that appear to be part of an SEO link farm, designed to manipulate search results and lure users to malicious sites. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.ru/pify?keyword=oceanography+an+invitation+to+marine+science+pdf+free
    • http://files.bingludu.com/uploads/1/3/0/7/130740249/korabediduk-gowux-januvid.pdf
    • http://files.squareonegoodsco.com/uploads/1/3/2/6/132695575/melasevojudemakijel.pdf
    • http://files.maarer.com/uploads/1/3/1/3/131381614/16ad56719.pdf
    • http://loweb.elleebphotography.com/uploads/1/3/0/7/130738615/lowusog-ruvijerineb.pdf
    • http://files.trinityhouseentertainmentinc.com/uploads/1/3/1/6/131606550/8581045.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/6354/1917/files/startup_restaurant_business_plan_sample.pdf
    • https://cdn.shopify.com/s/files/1/0432/1044/0862/files/subordinating_conjunctions_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/9478/5694/files/48305210677.pdf
    • https://cdn.shopify.com/s/files/1/0437/1437/9930/files/uae_new_arbitration_law.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/vefonomuvejup.pdf
    • https://cdn.shopify.com/s/files/1/0429/6274/7548/files/rexoletasezoloxilugex.pdf
    • https://cdn.shopify.com/s/files/1/0438/1540/3677/files/togaza.pdf
    • https://cdn.shopify.com/s/files/1/0433/5344/0414/files/best_book_to_learn_french.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6615/files/xiwokogikaruvuro.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94323725826.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/xujifuxowarisixiku.pdf
    • https://cdn.shopify.com/s/files/1/0432/7289/6672/files/lejegalog.pdf
    • https://cdn.shopify.com/s/files/1/0431/0663/1833/files/early_literacy_skills.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3640/files/22878615435.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_off0000791e.bin
5d2f3ce19c123b8518a69843d62fd8f1a5aa1065ed74702fa267c5960a908be2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x791E 5516 bytes
font_01_sfnt_off00008bb1.bin
6a65905cc9f4cfd48eddfa4e44f732c5dc78a0a9220d6b7828af94742d8b3f69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB1 10464 bytes
font_02_sfnt_off0000af7f.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7F 4324 bytes

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