Malicious PDF — malware analysis report

Static analysis result for SHA-256 8937b237a7d28bad…

MALICIOUS

PDF

51.9 KB Created: 2020-08-05 05:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd927765dc78bd1b25da6611ac662722 SHA-1: 09f2e88755dc47c7f97c79aa7d588360d8ae9636 SHA-256: 8937b237a7d28badd341b2027dfe53030fa3e50602c6ce3cda0ababa75cc678d
152 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a large number of embedded links, suggesting an SEO manipulation or link farm tactic. The primary malicious URL identified is https://ttraff.cc/pify?keyword=first+world+war+history+in+telugu+pdf, which is likely used to redirect users to further malicious content. The document body contains garbled text but also includes the suspicious URL and numerous benign-looking Shopify URLs, further supporting the link farm hypothesis.

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=first+world+war+history+in+telugu+pdf
    • http://files.rawseries.org/uploads/1/3/1/4/131454012/2562107.pdf
    • http://files.sabrinaeisenbarth.com/uploads/1/3/1/8/131856330/1716977.pdf
    • http://files.akadeltapsiomega.org/uploads/1/3/1/8/131857270/fadila_kuwaselilinuno_gefig.pdf
    • http://files.eternalimpactmissions.org/uploads/1/3/1/0/131070207/d4ca2.pdf
    • https://cdn.shopify.com/s/files/1/0434/6055/9013/files/sovofoputobifu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1326/6846/files/33214883911.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20424522606.pdf
    • https://cdn.shopify.com/s/files/1/0431/2639/0946/files/sirosasivirizizababob.pdf
    • https://cdn.shopify.com/s/files/1/0429/6520/5141/files/lufoludotavenimetesuludud.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81236671698.pdf
    • https://cdn.shopify.com/s/files/1/0438/3404/8669/files/vosor.pdf
    • https://cdn.shopify.com/s/files/1/0436/0493/4814/files/wikujofitowi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/56907995709.pdf
    • https://cdn.shopify.com/s/files/1/0444/0326/1606/files/appetizer_recipes_book.pdf
    • https://cdn.shopify.com/s/files/1/0436/6021/4425/files/delete_discord_messages.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_off00008d6c.bin
304e2a8cf222ed884bbf21d21fda16268826f8b29c859b8e9a2b5f0030282033
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D6C 5452 bytes
font_01_sfnt_off0000a010.bin
5af7c8fb414103f6cdea6e8bdfd6fa8aba386c39211bea175da97f379a4a94bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xA010 9940 bytes