Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3759c2a635906b…

MALICIOUS

PDF

35.6 KB Created: 2020-08-29 22:40:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fad1cdd13850d875633d61ae0b8c8f35 SHA-1: f14410917efd8d64383b50e6a4ff10fe24b776b5 SHA-256: 3b3759c2a635906bba21e209d93d31fbf29853f362430c94ba25196ec15fd6ed
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious URL, ttraff.cc, which is advertised with a lure for 'grace and frankie torrent download'. The document also hosts a large number of external PDF links, many pointing to Shopify, suggesting a link farm designed to attract traffic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection.

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/wix?keyword=grace+and+frankie+torrent+download
    • https://cdn.shopify.com/s/files/1/0428/3429/6988/files/57406861311.pdf
    • https://cdn.shopify.com/s/files/1/0436/2400/5794/files/lopozudeno.pdf
    • https://cdn.shopify.com/s/files/1/0461/3740/9689/files/28404091344.pdf
    • https://cdn.shopify.com/s/files/1/0428/8276/0870/files/pokuditezoje.pdf
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/xubexuker.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9379/files/lorimelimuzupunitu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6960/2978/files/52960145640.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0810/files/street_fighter_legacy_full_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2411/files/dugitofizugo.pdf
    • https://cdn.shopify.com/s/files/1/0465/0129/8334/files/teamviewer_14_host.pdf
    • https://cdn.shopify.com/s/files/1/0447/8880/9889/files/composition_and_structure_of_atmosphere_ncert.pdf
    • https://cdn.shopify.com/s/files/1/0436/1384/7714/files/99981180664.pdf
    • https://cdn.shopify.com/s/files/1/0462/2440/8730/files/tirizoxalupa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0342/0570/files/turozaruvo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3171/4202/files/carta_a_mi_esposo_por_su_cumpleaC3B1os.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_off00004f50.bin
32feaf275b63df346b5aafc30b03e24ad0e05f2e636bd22bafe9d182b6c96ad2
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F50 5024 bytes
font_01_sfnt_off0000608c.bin
f5dd59980ddb7f46f6af3c9a5c26bba051c4733b36acad69df4cd66ba9b32785
pdf-font-stream PDF embedded font (sfnt) at offset 0x608C 9580 bytes