Malicious PDF — malware analysis report

Static analysis result for SHA-256 246cb9d4d0f3604c…

MALICIOUS

PDF

43.2 KB Created: 2020-08-19 04:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fdd626f7e9bec7bcbf49cf4749aacf5 SHA-1: 1bd030d2e57aaf276db044f608d7508f91e782da SHA-256: 246cb9d4d0f3604c190b04db572efb21f81e6e1836e72efa03cb475349a58062
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 classifier as malicious and contains a large number of external links, many pointing to Shopify domains hosting other PDFs. One critical heuristic identified a link to a known malicious redirector infrastructure at `ttraff.cc`. The document body, though heavily obfuscated, contains the same redirector URL and several Shopify links, suggesting a link farm designed to distribute malicious content or lead users to phishing sites.

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.cc/pify?keyword=cop+out+movie+parents+guide
    • http://files.coratoloassociatesllc.com/uploads/1/3/2/6/132696580/d5f45e5.pdf
    • http://files.frescooperatheatre.com/uploads/1/3/1/3/131397934/5754352.pdf
    • http://files.yoursaltsource.com/uploads/1/3/1/8/131871466/pirigovukepixetovan.pdf
    • http://pepag.greenridgewoodnj.org/uploads/1/3/1/0/131069806/rutasuvelovu-damuxijenuvaxi-dujuguju.pdf
    • https://cdn.shopify.com/s/files/1/0432/5087/6578/files/adultery_in_the_bible.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/balance_sheet_reconciliation_excel_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/8547/1656/files/60181117047.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/fefadimuvesem.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8048/files/720813682.pdf
    • https://cdn.shopify.com/s/files/1/0432/4907/4336/files/39187494420.pdf
    • https://cdn.shopify.com/s/files/1/0435/9267/9582/files/xifarewafopiwo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3957/2643/files/95004378265.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/20249879831.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67331216746.pdf
    • https://cdn.shopify.com/s/files/1/0437/1090/6518/files/math_games_for_grade_2.pdf
    • https://cdn.shopify.com/s/files/1/0435/0607/3759/files/75436300654.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1126/files/lulimik.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_off00006aaf.bin
e759c6040cf8f36bff1dea8ff2a8739bcd48f1d668fa65157cd6444146962a6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAF 5212 bytes
font_01_sfnt_off00007c55.bin
154ec2f2237b323a47368927ed374bb053a280d09e421803193053131812f129		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C55 10384 bytes

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