Malicious PDF — malware analysis report

Static analysis result for SHA-256 055e0466d3824bac…

MALICIOUS

PDF

43.3 KB Created: 2020-08-06 22:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7167c8ae071ec431129b9b474f71d21f SHA-1: 695e6ba8cb656a5d170a899a33d4882a25cac394 SHA-256: 055e0466d3824bac3f7404db5611dda45555eb40b5811e6d36228e6dd808b56f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://ttraff.ru/pify?keyword=anemia+hemolitica+fisiopatologia+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the same malicious URL and benign-looking PDF filenames, indicating a lure to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious.

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.ru/pify?keyword=anemia+hemolitica+fisiopatologia+pdf
    • http://files.goderichmakers.ca/uploads/1/3/0/7/130739616/titixisob.pdf
    • http://files.hudsonvalleygarlicgrowers.com/uploads/1/3/2/6/132695679/afeee.pdf
    • http://files.condzellasfarm.com/uploads/1/3/0/9/130969555/97c8dd5b0b0479.pdf
    • http://files.chromecomputers.net/uploads/1/3/1/4/131438843/wewiwimox-zurajefenefuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8765/0211/files/jidemunage.pdf
    • https://cdn.shopify.com/s/files/1/0440/0339/3694/files/elementary_principle_of_chemical_process.pdf
    • https://cdn.shopify.com/s/files/1/0427/9762/9596/files/89874063484.pdf
    • https://cdn.shopify.com/s/files/1/0435/9805/3535/files/4727215484.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6250/files/lazofafupubanibam.pdf
    • https://cdn.shopify.com/s/files/1/0434/6940/6360/files/prentice_hall_classics_algebra_2_with_trigonometry.pdf
    • https://cdn.shopify.com/s/files/1/0434/7366/6213/files/62267710245.pdf
    • https://cdn.shopify.com/s/files/1/0437/0006/0310/files/35218592601.pdf
    • https://cdn.shopify.com/s/files/1/0429/2775/1321/files/2402027752.pdf
    • https://cdn.shopify.com/s/files/1/0433/7005/3784/files/42762784326.pdf
    • https://cdn.shopify.com/s/files/1/0432/3983/3755/files/57553953021.pdf
    • https://cdn.shopify.com/s/files/1/0432/5326/8642/files/75151446474.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_off00006b25.bin
1fa1ace1325057dedaaee3ab05c870835490a9e720ba266d2bd2907fa7986171		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B25 5464 bytes
font_01_sfnt_off00007d98.bin
7472ad37de98b479c22fe77ed0bc070096cc3254272b38e106764ad302d3e718		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D98 10432 bytes

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