Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f90b8313e99e0e…

MALICIOUS

PDF

47.3 KB Created: 2020-08-16 00:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3052642e05057a27f6cee98cbe4a29c SHA-1: 2bcbf05928786162798cd1af1216f680dcf2b603 SHA-256: 72f90b8313e99e0e60203f73a8c490623264c7f5bf6173ae8a649266479abc56
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one pointing to a known malicious redirector at 'https://ttraff.cc/wb?keyword=zaleski%20backpack%20trail%20pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into clicking it. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs points towards a phishing or redirection scheme.

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/wb?keyword=zaleski%20backpack%20trail%20pdf
    • http://jugev.party-junkies.com/uploads/1/3/1/0/131070588/dexaxitudarared.pdf
    • http://gizugu.calgarypopupweddings.com/uploads/1/3/1/4/131454106/mugoja_vujarewijafimob.pdf
    • http://files.yvfoodhub.com/uploads/1/3/2/6/132682689/7808015.pdf
    • http://files.canberracelebranteileen.com/uploads/1/3/1/1/131163599/fuvozizemitagi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/4691/0624/files/agamemnon_online.pdf
    • https://cdn.shopify.com/s/files/1/0427/4877/2519/files/89232386066.pdf
    • https://cdn.shopify.com/s/files/1/0440/4061/8134/files/idsa_septic_shock_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0430/9408/1687/files/biotecnologia_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/71928100664.pdf
    • https://cdn.shopify.com/s/files/1/0433/0625/4504/files/88867529054.pdf
    • https://cdn.shopify.com/s/files/1/0433/7755/7660/files/69429377578.pdf
    • https://cdn.shopify.com/s/files/1/0428/7388/0739/files/turela.pdf
    • https://cdn.shopify.com/s/files/1/0434/6114/8832/files/3812328696.pdf
    • https://cdn.shopify.com/s/files/1/0430/6354/1917/files/key_highlights_of_interim_budget_2020.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e60.bin
dc32dd803a9d9f1c21c2fa86ef3b9d1c3c4d30f7aaf0a10d30039ce2905187fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E60 4884 bytes
font_01_sfnt_off00007f07.bin
60e05ec4453a82c7982b2542872bc72c05ef4c4020e32d108dd4ae8f98eaed66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F07 10340 bytes
font_02_sfnt_off0000a258.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA258 4324 bytes

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