Malicious PDF — malware analysis report

Static analysis result for SHA-256 03edef268f3c8798…

MALICIOUS

PDF

58.2 KB Created: 2020-08-22 13:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c14a77b9681a2881d073b37dad34aff8 SHA-1: 4e9fbd86df3d10bbf02d5ead779fe6f3fa16365c SHA-256: 03edef268f3c87985849ab3d3f6f360f444f6f7bb3680829cd9daf6fb313e3b2
214 Risk Score

Malware Insights

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

The PDF contains a lure for 'Netacad IT Essentials Chapter 10 Exam Answers' which links to a known malicious redirector. The document also hosts a large number of other PDFs, suggesting a link farm for SEO poisoning or traffic generation. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs points to a phishing or redirection attack.

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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=netacad+it+essentials+chapter+10+exam+answers
    • http://files.wolverinemarketporthuron.com/uploads/1/3/1/3/131381288/xafoj_juwiti.pdf
    • http://files.prigitalsolutions.com/uploads/1/3/1/0/131071076/577897.pdf
    • http://files.graffitispotbengals.com/uploads/1/3/0/7/130775261/7912034.pdf
    • http://rumusin.ajsartstudio.com/uploads/1/3/1/3/131383042/08b84edb29b9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7960/6177/files/carroll_diagram_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/4859/8678/files/ritukupedunoro.pdf
    • https://cdn.shopify.com/s/files/1/0431/5450/5885/files/lajoweweko.pdf
    • https://cdn.shopify.com/s/files/1/0428/3102/0198/files/61714308420.pdf
    • https://cdn.shopify.com/s/files/1/0435/3271/4135/files/vukisutaxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9565/4564/files/glucose_challenge_test_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5609/files/xalogipumawufubezefanax.pdf
    • https://cdn.shopify.com/s/files/1/0434/2477/6354/files/devefabot.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9535/files/ammonium_nitrate_explosives_for_civil_applications.pdf
    • https://cdn.shopify.com/s/files/1/0440/5736/2584/files/lic_jeevan_akshay_189_proposal_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/6767/8618/files/94952412878.pdf
    • https://cdn.shopify.com/s/files/1/0433/1238/2116/files/adventure_rank_quest_guide_ragnarok_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0446/6016/2713/files/sunrise_university_aicte_approval_letter.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_off0000a63b.bin
1bcffe6f8b4cf1549cd7d57aa50b76f3c2ec88762e4c461095119d649c62cc64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA63B 5636 bytes
font_01_sfnt_off0000b94c.bin
7434a776768b29a08c298f118b5ab57177085e4f72a5968246b5ed7c6e26a334		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB94C 10052 bytes

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