Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4410a1e3f9898f3…

MALICIOUS

PDF

46.0 KB Created: 2020-07-21 10:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa19055b32bdeb6b79439547898da4a1 SHA-1: 9aaa94bc9259233b4358b6ae68fd1908f70eb485 SHA-256: a4410a1e3f9898f3b1804417cf60824e145dedcd212f93a269632e607c35c656
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector at 'ttraff.ru'. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and link distribution strongly indicate a malicious intent, likely to direct users to harmful 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.ru/wb?keyword=moscow%20center%20map%20pdf
    • http://files.enfusiasticart.com/uploads/1/3/1/4/131438180/pekepewu_zipamosezili_zesaregoxekiv_fofafozon.pdf
    • http://files.assonetkennel.com/uploads/1/3/0/7/130775840/bitamutosufaro.pdf
    • http://files.thetrue.org/uploads/1/3/1/4/131437778/9659504.pdf
    • https://cdn.shopify.com/s/files/1/0428/4094/8892/files/67345310253.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/91275585753.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78539107281.pdf
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/sinufaji.pdf
    • https://cdn.shopify.com/s/files/1/0433/8050/6773/files/tidulakurobikedijof.pdf
    • https://desinum.files.wordpress.com/2020/07/fijaxodub.pdf
    • https://mapowinonu.files.wordpress.com/2020/06/8224113119.pdf
    • https://wafadonob.files.wordpress.com/2020/06/94345331983.pdf
    • https://jizezirejote.files.wordpress.com/2020/07/41397955684.pdf
    • https://cdn.shopify.com/s/files/1/0431/5299/8556/files/koxuwenijovimuzadoru.pdf
    • https://cdn.shopify.com/s/files/1/0435/2868/3672/files/puxatazageb.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/57039826173.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nitopufekuriwuk.pdf
    • https://cdn.shopify.com/s/files/1/0437/6831/6055/files/52975518422.pdf
    • https://cdn.shopify.com/s/files/1/0437/0199/3622/files/90698820139.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1040/files/netesakelopitorikiwed.pdf
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/32283296716.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/
    • https://cdn.shopify.com/s/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000779b.bin
d50fe39ce6f88c10823b3a48ccd382347afa750e4607a072aacf9cb665758009		 pdf-font-stream PDF embedded font (sfnt) at offset 0x779B 5108 bytes
font_01_sfnt_off000088eb.bin
02c1ca77d2534b676fe58ff867c4b82632c18b94b8eeff1bb707b2ee1ce63a37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88EB 9928 bytes

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