Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3581bd3e9764a3…

MALICIOUS

PDF

50.5 KB Created: 2020-08-13 09:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef4e618c1ccfd9ee31308dec875e26e9 SHA-1: 842f362c7e5de6d477803a8ace2e3bde2353518e SHA-256: 9c3581bd3e9764a3041bbb3bc325a5c6c8482afb1489712a729be9d6fca9552f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains numerous embedded links, many pointing to Shopify domains and a primary redirector at ttraff.ru. The heuristic firings indicate this is a link farm designed for SEO manipulation and malicious redirection. The document body, though partially corrupted, contains the URL 'https://ttraff.ru/wb?keyword=spanish%20worksheets%20for%206th%20grade', suggesting a lure to disguise the malicious intent. No scripts were extracted, but the primary attack vector is the mass of malicious links.

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=spanish%20worksheets%20for%206th%20grade
    • http://files.marketinginsanity.net/uploads/1/3/0/8/130813516/jimiralu.pdf
    • http://files.mumbisdesigns.com/uploads/1/3/1/8/131871618/a5684a08eb.pdf
    • http://files.customhighlightvideos.com/uploads/1/3/0/8/130874121/7667425.pdf
    • http://files.brainchildlangley.ca/uploads/1/3/2/6/132696335/jejegamuwafiduxin.pdf
    • http://files.monumentblog.com/uploads/1/3/0/7/130739190/fd2cbdf3.pdf
    • https://cdn.shopify.com/s/files/1/0431/9051/7917/files/97753201674.pdf
    • https://cdn.shopify.com/s/files/1/0437/0323/8811/files/xudagekewepofibun.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/19646836755.pdf
    • https://cdn.shopify.com/s/files/1/0429/9338/5633/files/86074457362.pdf
    • https://cdn.shopify.com/s/files/1/0437/6176/2456/files/20016885219.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/58513900037.pdf
    • https://cdn.shopify.com/s/files/1/0432/2017/2957/files/33257634988.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/80483055074.pdf
    • https://cdn.shopify.com/s/files/1/0429/3525/5203/files/lukekajiruzavofikawenik.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12339474235.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/jebutotoxesavigosokoguwo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078c6.bin
0835e6df7ec024a819ac3c938c253bdbfe5e9fbebab62e2f4c3fd3e1d4757192		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78C6 5472 bytes
font_01_sfnt_off00008b5e.bin
27fab6cac3e462e1d6673433014c8d7726301d634b5e7e453d165b4d5a23f057		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B5E 10400 bytes
font_02_sfnt_off0000aecf.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAECF 4324 bytes

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