Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dda5c870897bb4f…

MALICIOUS

PDF

43.8 KB Created: 2020-08-09 18:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf5ea23597955832e2ab6893e71ac2c4 SHA-1: 720485b52a581d45a8faaf95c5512b088310710e SHA-256: 3dda5c870897bb4f992422fa2937d4d5d4ff281c5036f3094312b14058beaf87
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link redirects to a known malicious URL (ttraff.ru). This indicates a link farm or redirection tactic designed to lead users to malicious content. The ML classifier also 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=persuasive+writing+quiz+pdf
    • http://files.allentraining.co.uk/uploads/1/3/1/4/131414134/pojixekidojuxax_jozupuxe.pdf
    • http://wemol.mmsensemble.org/uploads/1/3/2/6/132681670/6042795.pdf
    • http://voxibedob.melshand.com/uploads/1/3/1/6/131606407/7d6a6f65ee0.pdf
    • http://files.classicalteachingtextbook.com/uploads/1/3/0/7/130739385/5818843.pdf
    • http://files.allislandmartialarts.com/uploads/1/3/1/3/131398224/cdd72a2.pdf
    • http://files.allislandmartialart
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/pijakal.pdf
    • https://cdn.shopify.com/s/files/1/0432/1571/6513/files/da_yoopers_second_week_of_deer_camp.pdf
    • https://cdn.shopify.com/s/files/1/0439/2157/2008/files/i_love_split.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4602/files/25685674825.pdf
    • https://cdn.shopify.com/s/files/1/0430/4375/0049/files/tigogaxinowuja.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9029/files/79176813222.pdf
    • https://cdn.shopify.com/s/files/1/0431/8386/6007/files/8708961853.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fixasitisajixumazurezeve.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/disenteria_amebiana_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0432/8348/0736/files/58829492614.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/61999556924.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3294/files/jizudenika.pdf
    • https://cdn.shopify.com/s/files/1/0431/2337/6277/files/75272654615.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_off00006c93.bin
382f8d23d61f7d92c5bb1dc21a508251b9da72dae53691e7f11075151c8745c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C93 5504 bytes
font_01_sfnt_off00007f76.bin
ee3b5a5e4b6de4be3379e27ccbb11c3011bf4b4b2acb478493a180fc2a345457		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F76 10036 bytes

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