Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b92af1ff03f76c8…

MALICIOUS

PDF

48.4 KB Created: 2020-07-27 13:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30f2de74b58ba749f0f39dfc6b0f00e7 SHA-1: 5492eb25d3a610a481c44b0dfca82c37eb450698 SHA-256: 1b92af1ff03f76c898b2f54dd80c00cf6229db405c4d8662b74b62a6519c2f65
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning model and contains numerous embedded links. A critical heuristic identified a link to a known malicious redirector infrastructure, and another critical heuristic indicated a large PDF link farm hosted on Shopify. These findings suggest the document is designed to lead users to malicious sites or engage in SEO manipulation for malicious purposes. The presence of many Shopify links, even if some are marked benign, indicates a coordinated effort to host or distribute content.

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=gcse+english+paper+1+model+answers
    • http://files.fellowshipforward.org/uploads/1/3/0/8/130874264/1645225.pdf
    • http://files.kelownaplumbingsolutions.com/uploads/1/3/1/3/131381078/fawubi.pdf
    • http://files.schec.net/uploads/1/3/1/8/131871894/6851944.pdf
    • http://files.thedivinesophia.com/uploads/1/3/0/8/130813301/9789180.pdf
    • http://files.moveovermsa.org/uploads/1/3/1/6/131606631/8576641.pdf
    • http://files.moveovermsa
    • https://cdn.shopify.com/s/files/1/0429/7952/4759/files/finizizewuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/7019/2802/files/kigixemo.pdf
    • https://cdn.shopify.com/s/files/1/0435/6043/5871/files/komamejag.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mujunevuduw.pdf
    • https://cdn.shopify.com/s/files/1/0431/6682/6656/files/bakobezo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/61426691821.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/sowale.pdf
    • https://cdn.shopify.com/s/files/1/0432/6440/9764/files/fitubofizotemawodavikibow.pdf
    • https://cdn.shopify.com/s/files/1/0436/8013/7369/files/pixakisexukapo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/sebetotowu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2060/5848/files/25207204523.pdf
    • https://cdn.shopify.com/s/files/1/0432/5769/2320/files/mamutezejimof.pdf
    • https://filestore.aqa.org.uk/sample-papers-and-mark-s
    • 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_off0000804a.bin
dd56aecd1fa4dc8d481e14ebc31034970472d5d79ceb0662b5f5a7b9733aff4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x804A 5368 bytes
font_01_sfnt_off00009261.bin
5bb15caa0ed84c5032c620bf0a09768e5acbdf4352b3ea7f434775beb0f65920		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9261 9888 bytes

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