Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1f12d51c48b706…

MALICIOUS

PDF

38.4 KB Created: 2020-08-05 06:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0848882deacd6637fa48ac6db0b578e0 SHA-1: 269905068a9c3fd4bf24bec057fcc2008ee67a9a SHA-256: 1b1f12d51c48b706f5c21743af66ab51abb6b3bd07da3908799817e2774806c1
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing for a malicious redirector link to 'ttraff.cc'. The document body, though heavily obfuscated, also contains this URL and other Shopify URLs, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The primary intent appears to be redirecting the user to malicious infrastructure.

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=battletech+mech+sheets+pdf
    • http://files.jensencars.org/uploads/1/3/1/0/131071167/zogelumijefujap.pdf
    • http://files.jtfas.org/uploads/1/3/1/4/131484603/5740102.pdf
    • http://files.sagehillstables.com/uploads/1/3/1/0/131071231/wowuned_mixorebuj_zomot_tabokilunuga.pdf
    • http://semunako.worshipinternationalchurch.com/uploads/1/3/0/7/130739625/8190808.pdf
    • https://cdn.shopify.com/s/files/1/0433/9708/7390/files/addiction_recovery_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/3227/3319/files/fomigubetu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2771/6520/files/jizavojejugejisotinupof.pdf
    • https://cdn.shopify.com/s/files/1/0436/6453/9798/files/tegojasuvowibe.pdf
    • https://cdn.shopify.com/s/files/1/0429/7005/4805/files/9474977912.pdf
    • https://cdn.shopify.com/s/files/1/0428/5395/7799/files/lojidekalilov.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0421/files/50430833182.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/monazata.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9877/files/35266100642.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/how_make_arrow_java.pdf
    • https://cdn.shopify.com/s/files/1/0432/6473/7433/files/1013827602.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9432/files/pinawosubawugezopaja.pdf
    • https://cdn.shopify.com/s/files/1/0431/7495/3120/files/tivanenijan.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_off00004b85.bin
d491cf430ef062fb354ce75d2e646f68036befbe92e0d170e58b9a1e57ec95ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B85 4872 bytes
font_01_sfnt_off00005c1b.bin
c0079bcd677fa98cc8ff46cdf48c6750ab540dffe63cffd44ac98e1b941ad795		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C1B 10092 bytes
font_02_sfnt_off00007ea6.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA6 4324 bytes

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