Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1267979e54e7233…

MALICIOUS

PDF

37.0 KB Created: 2020-08-12 08:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dab2edb7cb655fddd9f4936ad351897 SHA-1: 7cf41006ae9691146134706f1671787ca426da34 SHA-256: b1267979e54e723319b8810848d4c2e27329ea1afdf5bc30ae0b8e1e94353e4f
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. This URL is likely used to lure victims into downloading malicious content or visiting phishing pages. The document body also contains this URL and other embedded URLs, reinforcing the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=aurelio+baldor+algebra+pdf+gratis
    • http://files.chenowethbairddesign.com/uploads/1/3/1/8/131871894/kawal_fudomur.pdf
    • http://files.nativeadvancement.com/uploads/1/3/1/4/131407695/2286789.pdf
    • http://files.termarkleather.com/uploads/1/3/2/6/132682665/85b01c3aa355523.pdf
    • http://files.tutejalab.org/uploads/1/3/0/7/130776401/0c4ac940b.pdf
    • http://bamab.sixpersimmonsyoga.com/uploads/1/3/0/7/130738799/basipifibaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54058680795.pdf
    • https://cdn.shopify.com/s/files/1/0437/5986/1909/files/50598765316.pdf
    • https://cdn.shopify.com/s/files/1/0434/1019/4582/files/5482371042.pdf
    • https://cdn.shopify.com/s/files/1/0432/7384/6952/files/piscicultura_familiar_no_amazonas.pdf
    • https://cdn.shopify.com/s/files/1/0435/8701/0715/files/38691262725.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/45481116683.pdf
    • https://cdn.shopify.com/s/files/1/0430/7917/2257/files/56678112032.pdf
    • https://cdn.shopify.com/s/files/1/0429/5675/1002/files/56022492932.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3358/files/josujoxuriwenedusazov.pdf
    • https://cdn.shopify.com/s/files/1/0433/9263/0940/files/94532566314.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_off000050e3.bin
876f124378f15350fff64fe6ee28e51c004b42db43b3799e6d459d4a496940bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x50E3 5336 bytes
font_01_sfnt_off00006312.bin
77c6b9d5f197a853d1832ad3633c6165ef310fdec375fd9e76e8cb36c2b28672
pdf-font-stream PDF embedded font (sfnt) at offset 0x6312 10604 bytes