Malicious PDF — malware analysis report

Static analysis result for SHA-256 166bc8f146d6e665…

MALICIOUS

PDF

39.8 KB Created: 2020-08-12 18:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da4cfb11b75ef7656dc30eb508379d86 SHA-1: 70c5214968768da924d37f938fa0d9ecb588a7e8 SHA-256: 166bc8f146d6e6655a47480bad2d3701ef804688d421fdddef8e6184c11395a4
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to a known malicious redirector infrastructure at ttraff.ru. The document body, though heavily obfuscated, contains the same URL and keywords suggesting a lure. 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 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/wb?keyword=preventive%20maintenance%20procedure%20pdf
    • http://lotifapil.fourteegames.com/uploads/1/3/1/3/131398560/abca88.pdf
    • http://biwepudo.vermonttrufflecompany.com/uploads/1/3/0/7/130738894/2381334.pdf
    • http://files.newsummitacademy.com/uploads/1/3/1/0/131070625/lijizuzasilof_zezokurave.pdf
    • http://jovukere.battiago.com/uploads/1/3/0/7/130775162/7454511.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5265/5004/files/88037045711.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0071/files/25537292238.pdf
    • https://cdn.shopify.com/s/files/1/0435/0109/3030/files/zowutazekapesagemifixoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/1871/4264/files/9564877477.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1126/files/22770848261.pdf
    • https://cdn.shopify.com/s/files/1/0450/6664/9750/files/agile_methodology_for_project_management.pdf
    • https://cdn.shopify.com/s/files/1/0429/5655/4394/files/43922737039.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/mimof.pdf
    • https://cdn.shopify.com/s/files/1/0429/1425/0905/files/nz_army_news.pdf
    • https://cdn.shopify.com/s/files/1/0445/4642/4991/files/bikini_body_guide_nutrition_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/4537/0518/files/47217813843.pdf
    • https://cdn.shopify.com/s/files/1/0433/8935/4142/files/35410384769.pdf
    • https://cdn.shopify.com/s/files/1/0432/2020/5726/files/36297713594.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_off00005e96.bin
c617735a0e36bbd5d2706f5273da694f59642592440f659f15cc878079c4ea3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E96 5152 bytes
font_01_sfnt_off00007002.bin
6159aaac18dd0910413f4c4dd29c80301a33e05c3aedaa68d8bbb2715c6227dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7002 10064 bytes

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