Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb9f2d8defb1239…

MALICIOUS

PDF

37.2 KB Created: 2020-09-01 01:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca7209ae6afc42d79e930398f9017aff SHA-1: a6122c1966990352db220ecb29f4f1dec2ee00fe SHA-256: cbb9f2d8defb1239a6aab60f64e8a4ee1e3e59fecfe4e8996e5c7dc68f003fec
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'charley pride sheet music' and the malicious URL, suggesting a lure. The presence of multiple links to external PDFs, some hosted on static.usrfiles.com, indicates a link farm strategy. 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.club/wix?keyword=charley+pride+sheet+music
    • https://static.usrfiles.com/ugd/b8c837_29b7b00f22784d17b0900dcefed3238d.pdf
    • https://static.usrfiles.com/ugd/6c032c_fd81cd62aae347368501d807fcae057b.pdf
    • https://static.usrfiles.com/ugd/50de67_371ee27c03894e2b8fdf0eaf0ddac67d.pdf
    • https://static.usrfiles.com/ugd/e2b09b_57bbac952c574ae0aeb82bb8c9dd3d7c.pdf
    • https://static.usrfiles.com/ugd/4cf28d_ff9540689d074bf9a552ee0863428ded.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fawalonilon.pdf
    • https://cdn.shopify.com/s/files/1/0436/0024/8995/files/checklist_for_wedding_planning.pdf
    • https://cdn.shopify.com/s/files/1/0444/4087/9271/files/liste_alimentation_grossesse.pdf
    • https://cdn.shopify.com/s/files/1/0460/1354/6655/files/california_net_operating_loss_carryback_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/2640/7843/files/48316690300.pdf
    • https://cdn.shopify.com/s/files/1/0432/0857/3085/files/livro_administrao_de_empresas.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f8021d585d54564b8246edea1919694.pdf
    • https://static.usrfiles.com/ugd/1b8612_62ebd94db27b4a80955f14ce1a47b8f1.pdf
    • https://static.usrfiles.com/ugd/2ac701_e2599c9146bb40868ea6ffa2740fd9e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_9bff50e9c78c483594f051e38d170046.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_off00005321.bin
5a9d1c910a671901a3d72a15c5502f3ef8d9ef3fb01b1e4a0e3c36c3503ebdee
pdf-font-stream PDF embedded font (sfnt) at offset 0x5321 5320 bytes
font_01_sfnt_off00006512.bin
c3df735db2adcfac99f262a42aa4fe327558fcfcb1496f8507188b4e73fc344e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6512 10592 bytes