Malicious PDF — malware analysis report

Static analysis result for SHA-256 373778c116e008e7…

MALICIOUS

PDF

44.9 KB Created: 2020-08-18 23:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca437a9b4754ed668918de9fbabef8d8 SHA-1: 9cc323035ed9313597ca32da4cd7336600cc7594 SHA-256: 373778c116e008e796180b89d7806d5ee7428865e24492619a8132f1942090bc
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, specifically `https://ttraff.ru/pify?keyword=bed+sheets+king+size`. This redirector is likely used to obscure the final destination of the malicious payload. The PDF also functions as a link farm, containing numerous links to other PDFs hosted on Shopify, which is a common tactic for SEO poisoning and driving traffic to malicious sites. The ML classifier 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.ru/pify?keyword=bed+sheets+king+size
    • http://files.gretchenjude.com/uploads/1/3/0/7/130739510/lawikeluvige-vijipafigu-sazelax.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/aditivos_alimentarios_unam.pdf
    • https://cdn.shopify.com/s/files/1/0428/2476/1507/files/29565805532.pdf
    • https://cdn.shopify.com/s/files/1/0435/0948/1624/files/lezowolebopopomutum.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6295/files/41217840686.pdf
    • https://cdn.shopify.com/s/files/1/0437/9341/6349/files/62269371050.pdf
    • https://cdn.shopify.com/s/files/1/0436/9301/5195/files/anti_formiche_ad_ultrasuoni.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rajijabobuzev.pdf
    • https://cdn.shopify.com/s/files/1/0449/8427/1016/files/xugowuxijobiwukosanokikur.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7407/files/xaxolawadejixifev.pdf
    • https://cdn.shopify.com/s/files/1/0433/0802/3966/files/ba_first_year_english_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3880/files/zozenazoxadubififawoma.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_off00007296.bin
31e19eff6cee661df9f91f182d06a5331537e17a4a531305a9d0a1e9740dc8ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x7296 4912 bytes
font_01_sfnt_off00008356.bin
678aff9c31be3b9279973366d8420139568b50140574154bd288b7b425278f2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8356 10380 bytes