Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a53ca1c3f22945…

MALICIOUS

PDF

32.5 KB Created: 2020-08-23 17:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e83e7fc74fbabd4ea49e6f8ea924df3c SHA-1: b01ac66fcbe053837341391bb1ceb17d99922b26 SHA-256: f9a53ca1c3f22945ef5cf7aa6feb30e452a8699f1a5df2cde2932de35f2b864b
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which point to Shopify domains but one critical link redirects through ttraff.com. This indicates a link farm strategy, likely for SEO poisoning or to lure users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector. No scripts were extracted, and the document body is largely unreadable binary data, but the presence of the malicious redirector URL is the primary indicator of malicious intent.

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=bhakti+geetalu+bhakti+geet
    • http://fuwil.soarohio.org/uploads/1/3/0/8/130874113/jabaxosotelibo-mavitudul-volagexijufor.pdf
    • https://cdn.shopify.com/s/files/1/0432/5366/1858/files/briggs_and_straton_boat_motor.pdf
    • https://cdn.shopify.com/s/files/1/0429/2644/0607/files/zimexi.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2339/files/5384573835.pdf
    • https://cdn.shopify.com/s/files/1/0436/3704/7449/files/vafuzufeguvanaxosiwa.pdf
    • https://cdn.shopify.com/s/files/1/0462/3283/0106/files/muvederofoledobegew.pdf
    • https://cdn.shopify.com/s/files/1/0437/5104/7329/files/woxiwugoradiwubado.pdf
    • https://cdn.shopify.com/s/files/1/0429/8568/5153/files/67092865.pdf
    • https://cdn.shopify.com/s/files/1/0436/5654/4409/files/weather_underground_ridgecrest_ca.pdf
    • https://cdn.shopify.com/s/files/1/0434/8477/4552/files/gamilezuvo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5267/files/5070494028.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_off000043d8.bin
83e72e8cf3ad9684fce3fc9a9c1f908d4eebaefb912827c0f9cea9217a0d0047
pdf-font-stream PDF embedded font (sfnt) at offset 0x43D8 4928 bytes
font_01_sfnt_off0000549a.bin
594bb7e171bb5261cc2a12f03b18a575e8c570897cf403fd4b8471187aaecf9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x549A 9968 bytes