Malicious PDF — malware analysis report

Static analysis result for SHA-256 67bd2669715c33e3…

MALICIOUS

PDF

49.3 KB Created: 2020-08-05 23:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f41910ae44faff2dc91a4adc94f5d3e0 SHA-1: 1acf204eaa72760e10be21a2a204dc986682653d SHA-256: 67bd2669715c33e36ee703897e8f77b1a173906acf3badbf2ab448a7601a9257
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'bible quiz' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise malicious content. The presence of a large number of external PDF links further indicates a link farm or SEO spamming operation.

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/pify?keyword=malayalam+general+bible+quiz+pdf
    • http://files.sshvug.com/uploads/1/3/1/4/131438583/xobitukokuliw.pdf
    • http://files.justinpomerance.com/uploads/1/3/0/7/130739122/luxoforiko.pdf
    • http://laleg.barnarts.me/uploads/1/3/1/3/131379803/juxuw_lesim_datelij.pdf
    • http://files.themeditationpeople.co.uk/uploads/1/3/0/9/130969238/kezoma.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3874/3450/files/bigaweva.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2821/files/95426756581.pdf
    • https://cdn.shopify.com/s/files/1/0434/9313/0390/files/xeduzekapobiwatuvafo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0272/4506/files/58470592544.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/51248064838.pdf
    • https://cdn.shopify.com/s/files/1/0437/2260/4695/files/pufebuleruvejufom.pdf
    • https://cdn.shopify.com/s/files/1/0436/4143/8366/files/2569337279.pdf
    • https://cdn.shopify.com/s/files/1/0435/8651/9195/files/nikesikinadujiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/golitazuwosenov.pdf
    • https://cdn.shopify.com/s/files/1/0432/0555/8436/files/557587532.pdf
    • https://cdn.shopify.com/s/files/1/0430/9457/3205/files/agency_coupled_with_an_interest.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008278.bin
103a436435dcf3eb09afab3419b0a309f2961a26f425acdca5cc4177ac4a6248
pdf-font-stream PDF embedded font (sfnt) at offset 0x8278 5608 bytes
font_01_sfnt_off0000958b.bin
e94bd4144dab67522d459c324034081ac4ee49433659f9e19b7f666f1cf801a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x958B 10204 bytes