Malicious PDF — malware analysis report

Static analysis result for SHA-256 a896c0cfb7169f2a…

MALICIOUS

PDF

41.6 KB Created: 2020-09-17 07:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26e8e4da055619da26078fe578c8c838 SHA-1: 9b41d8a9bfbfde41633feaa213e6c28a4bdede3a SHA-256: a896c0cfb7169f2a8d653d00491e692680840730231183b901a889647670141c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it features a large number of embedded links, many pointing to external PDFs, suggesting a link farm or SEO abuse tactic. One of the primary links directs to 'https://ttraff.me/wix?keyword=cooks+12-cup+programmable+coffee+maker+manual', which is identified as a malicious redirector.

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.me/wix?keyword=cooks+12-cup+programmable+coffee+maker+manual
    • https://cdn.shopify.com/s/files/1/0432/9157/4430/files/escepticismo_moral.pdf
    • https://cdn.shopify.com/s/files/1/0434/9784/8996/files/58804738434.pdf
    • https://cdn.shopify.com/s/files/1/0431/6741/6471/files/dowuwilobopogijesuvuke.pdf
    • https://cdn.shopify.com/s/files/1/0429/5321/2060/files/67760621255.pdf
    • https://cdn.shopify.com/s/files/1/0432/7574/7491/files/59889333309.pdf
    • https://b88e134e-b6c8-4af6-a6fe-6ccd43389ad5.filesusr.com/ugd/ca9b0a_57ecc3cefd1b41fc912a576caff6346e.pdf?index=true
    • https://96a4e658-dac1-40c7-b8cc-9d9c02eb2fa3.filesusr.com/ugd/4542d9_baaa7f92f1c34a20bd7286cb0d6d07dd.pdf?index=true
    • https://a1662cff-bd7e-4ca1-848c-fd3d44a9f5a0.filesusr.com/ugd/140efa_96cef966e2d649e184ca18b799be059c.pdf?index=true
    • https://6037980f-cc51-4852-86cc-24c571eedda9.filesusr.com/ugd/501a20_893b3ab74b5145fd9ca672b942e9342f.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0434/0219/9196/files/nezesudifuka.pdf
    • https://cdn.shopify.com/s/files/1/0437/3279/5541/files/chemistry_lab_technician_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0427/5362/2182/files/ayyappa_bhajana_songs_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0430/7776/3226/files/fiwovimamitaxigizajota.pdf
    • https://cdn.shopify.com/s/files/1/0440/4723/7285/files/tuxumapudegu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8628/files/chicago_manual_of_style_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0434/5489/0149/files/tanogunuj.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006285.bin
7cb0f1c66043a6fb59afd565fbc3c946671ae8481d9e533e091ade862bc93e89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6285 5660 bytes
font_01_sfnt_off000075c4.bin
39d286eb0605bee927a8500449bd51f6c3e65e6126531b9cb4a2c74bb2d62f7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C4 10380 bytes

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