Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5199b4c8e76b19f…

MALICIOUS

PDF

37.8 KB Created: 2020-08-16 14:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14f40d5a6bf50cfab70766f55663e9a3 SHA-1: cfadf9d2375042925088beca583f779ef8cf5790 SHA-256: d5199b4c8e76b19f4fc143a0192b50bc13083c30e622f0a1a8f490e8e043d606
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL and numerous other links, many hosted on Shopify, suggesting a link farm or redirection strategy. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be social engineering via a deceptive link.

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=video+gif+converter
    • http://jerit.brentcue.com/uploads/1/3/1/3/131398575/pigezi.pdf
    • http://files.fitzwrestlingacademy.com/uploads/1/3/2/8/132814136/af34df.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6787/files/anteproyecto_de_tesis.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5410/files/3866764033.pdf
    • https://cdn.shopify.com/s/files/1/0435/8746/9469/files/accp_chest_guidelines_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/0675/3948/files/widosutukiwafukovaruluf.pdf
    • https://cdn.shopify.com/s/files/1/0429/2093/5590/files/25951837669.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4663/files/runepejepuwuraleb.pdf
    • https://cdn.shopify.com/s/files/1/0434/4925/4041/files/jewelowojumuwogikomupe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7070/files/senorita_audio_song_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8573/files/98377087257.pdf
    • https://cdn.shopify.com/s/files/1/0437/7290/3585/files/skid_steer_backhoe_attachment.pdf
    • https://ezgif.com/video-to-gif?url=https://example.com/video.mp4
    • 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_off0000570b.bin
80e00b363835c78273fd1170d3b352a7962b802f29695ff8f62b5b4883e3acb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x570B 4796 bytes
font_01_sfnt_off00006777.bin
4f5d2110b14694bd0b4b9168ce1b48437d3650a921c478b76f9e624a574a4b21
pdf-font-stream PDF embedded font (sfnt) at offset 0x6777 10352 bytes