Malicious PDF — malware analysis report

Static analysis result for SHA-256 18087ee57939c8ca…

MALICIOUS

PDF

45.6 KB Created: 2020-07-29 09:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c01379cfbf0eaa9a7ce84cb1a9f20a4 SHA-1: a2a55d99495d105a4f5a83e57ead137d2cdf913b SHA-256: 18087ee57939c8ca19973ef21ce805a1ff4c5e7307377e8f286dedf3d7665e90
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO abuse tactic. One critical heuristic indicates a link to known malicious redirector infrastructure, specifically `https://ttraff.ru/pify?keyword=pokemon+cards+game++apk`. This suggests the document's primary purpose is to redirect users to potentially malicious sites, likely for phishing or malware distribution.

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=pokemon+cards+game++apk
    • http://files.operationvirtue.com/uploads/1/3/1/6/131636956/6357375.pdf
    • http://files.hstmasia.org/uploads/1/3/1/8/131857115/fapusoxibezeteduso.pdf
    • http://files.mycorporatecounselor.com/uploads/1/3/1/4/131437983/1606706.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5308/7897/files/39631198968.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6743/files/zenijatizozitofikos.pdf
    • https://cdn.shopify.com/s/files/1/0428/2197/6220/files/35898481346.pdf
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/48934743864.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/voxijasidasevora.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2337/files/19837548237.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8280/files/tojiva.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xakisone.pdf
    • https://cdn.shopify.com/s/files/1/0438/4430/5061/files/51592838735.pdf
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/papulabowowu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5783/9254/files/xarow.pdf
    • https://cdn.shopify.com/s/files/1/0429/2391/7478/files/pupiwugagunosewuza.pdf
    • https://cdn.shopify.com/s/files/1/0432/0028/2783/files/10084865872.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_off00007495.bin
53a76c0e8990a3901a56acd2c1b54ec2153a860da8f3deadb3d5dd8aed393dc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7495 5084 bytes
font_01_sfnt_off000085b0.bin
f07c1b25b4c17fb834bd37fc543307ebf1f66c188a802dd49cbb870dbfa5bd7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85B0 10584 bytes

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