Malicious PDF — malware analysis report

Static analysis result for SHA-256 3294fa283619c75e…

MALICIOUS

PDF

49.9 KB Created: 2020-08-18 23:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 255ef9411080d062cb088743fcdf4ac3 SHA-1: 6a08a31fbd4af5531669dc1096a7def8b98f25f4 SHA-256: 3294fa283619c75e2ee63d700aaf2c8eb33bb0d84a3be817d79226eb05499490
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to benign Shopify URLs, but one critical link to 'ttraff.com' is identified as a malicious redirector. This suggests a link farm strategy to obscure the final malicious destination. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lure users to harmful content.

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=genetics+of+lactic+acid+bacteria+pdf
    • http://pagikesoz.beadsbybrandy.com/uploads/1/3/0/7/130738732/7935026.pdf
    • http://files.chrisheidt.net/uploads/1/3/1/4/131437322/roretomisibe-defejen-raxamugewif-rexubatuven.pdf
    • http://wejekivux.leftinspain.com/uploads/1/3/1/4/131407995/c260ecd8d429b.pdf
    • https://cdn.shopify.com/s/files/1/0430/1701/1353/files/cours_d_anglais_gratuit_pour_debutant.pdf
    • https://cdn.shopify.com/s/files/1/0433/5599/6328/files/patogenesis_anemia_defisiensi_besi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4927/8875/files/inotropic_drug.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/99795113968.pdf
    • https://cdn.shopify.com/s/files/1/0436/0998/1085/files/53496136653.pdf
    • https://cdn.shopify.com/s/files/1/0440/3786/5637/files/36583479955.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pesaveput.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98908457197.pdf
    • https://cdn.shopify.com/s/files/1/0430/0383/8615/files/80979412763.pdf
    • https://cdn.shopify.com/s/files/1/0441/2126/0184/files/mac_character_map.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_off00008610.bin
03a8d47e8a15a1c7bf408d7e2219392a1c6777551804b2eada3a7e071656f6fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x8610 5320 bytes
font_01_sfnt_off00009831.bin
b41811c2217fae889dd6552a24ff10b4e84e17f935b173e3820be1079c0db878
pdf-font-stream PDF embedded font (sfnt) at offset 0x9831 10120 bytes