Malicious PDF — malware analysis report

Static analysis result for SHA-256 80985009a19a9a50…

MALICIOUS

PDF

55.2 KB Created: 2020-07-30 20:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8143336976a9d19c8164520d26edf74d SHA-1: e701cee2ad0d749820caa37419ff37b4005ca026 SHA-256: 80985009a19a9a50c8130fc2fc360efd305c552b526b25e39904b28796374342
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged as malicious by multiple heuristics, including a redirector link and a link farm, indicating an attempt to drive traffic to malicious infrastructure. The presence of a 'password-protected archive lure' heuristic suggests a multi-stage attack where the user is prompted to obtain a password for a subsequent download. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear instructions or content beyond the title.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=ventajas+y+desventajas+del+liderazgo+transformacional+pdf
    • http://files.leo-theo.com/uploads/1/3/1/3/131379409/pozorudu_raxumujosubag_mowepi.pdf
    • http://files.roycebaptist.org/uploads/1/3/0/7/130740443/697391.pdf
    • http://files.electricslidinggates.co.uk/uploads/1/3/2/6/132682282/2558304.pdf
    • http://files.stokegiffordscouts.co.uk/uploads/1/3/0/7/130776111/cdb653ff.pdf
    • http://files.currantcreekoutfitters.net/uploads/1/3/1/4/131406662/kuruditomum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57727452667.pdf
    • https://cdn.shopify.com/s/files/1/0434/4191/4006/files/dufagu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2623/6063/files/63457195315.pdf
    • https://cdn.shopify.com/s/files/1/0435/1311/8872/files/78876004944.pdf
    • https://cdn.shopify.com/s/files/1/0435/4532/9832/files/80723922351.pdf
    • https://cdn.shopify.com/s/files/1/0433/3951/4006/files/8101912677.pdf
    • https://cdn.shopify.com/s/files/1/0431/6659/7288/files/nijinediza.pdf
    • https://cdn.shopify.com/s/files/1/0435/2484/9815/files/37226005164.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1255/files/33998756795.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/22205316212.pdf
    • https://cdn.shopify.com/s/files/1/0429/3056/9382/files/kasozotijefuludag.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009598.bin
a7ea6f4ca6470a73216cc006c5d38dc921436f35e75c0f2de4951dba1b5c8fc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9598 5516 bytes
font_01_sfnt_off0000a861.bin
5cdedb6d75d6a5b218ec0b3418ee01e068598c432c003e9a7a811079b785d35b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA861 11268 bytes

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