Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6cd93243ffcc5c…

MALICIOUS

PDF

42.8 KB Created: 2020-10-11 01:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e87fa03864a7651754a1998aba9fd1e8 SHA-1: f069e32c0d777d55b25a5f4355c6bcada5bd1b12 SHA-256: 6a6cd93243ffcc5cb32e083786e1f5447c650fe2e0a67fb055f45277c3e0205b
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, specifically `https://cctraff.ru/pify?keyword=organic+chemistry+i+for+dummies+free+pdf`. This suggests the document is designed to trick users into visiting potentially harmful sites under the guise of providing a free PDF. The ML classifier also strongly indicated maliciousness.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/pify?keyword=organic+chemistry+i+for+dummies+free+pdf In PDF document text
    • http://files.dogfrom.com/uploads/1/3/0/8/130874612/60e793112e663.pdfIn PDF document text
    • http://files.oakwoodowls.com/uploads/1/3/2/6/132683251/4fdded902d0c.pdfIn PDF document text
    • https://site-1039324.mozfiles.com/files/1039324/51146696467.pdfIn PDF document text
    • https://site-1036898.mozfiles.com/files/1036898/5460964444.pdfIn PDF document text
    • https://site-1040399.mozfiles.com/files/1040399/vizipebimusuv.pdfIn PDF document text
    • https://site-1036649.mozfiles.com/files/1036649/sivilibezegepuge.pdfIn PDF document text
    • https://site-1037864.mozfiles.com/files/1037864/dinonakovenowutag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7474/7545/files/foam_roller_core_exercises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8232/3870/files/pexobeta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0470/8715/7406/files/waronavuwobojino.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8222/2230/files/10906960770.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2889/8211/files/holt_french_1_cahier_d_activites_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7d4e0bc-df2d-4110-969e-f21aa3faf7ca/14731034414.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6603 5664 bytes
SHA-256: 1181e617865757e2d89402693a288fbf43a729a72cecfe4ea340427253c96982
font_01_sfnt_off0000791a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x791A 10304 bytes
SHA-256: 7a1f913392c8f8d71f242b92f233548a128a991d0887fc83ed31d32e97dd15b3

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