Malicious PDF — malware analysis report

Static analysis result for SHA-256 39fef35ef4ee60f2…

MALICIOUS

PDF

47.6 KB Created: 2020-09-10 22:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 166f38cb96b16f71ea878e0d06a16e5d SHA-1: a500b23fcfb3e14e4e2fff3ad5c92d92ce17988e SHA-256: 39fef35ef4ee60f2c5e23ed85c3d04b00a786d0e67d7bfb6dd87453e568a32ab
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=acdsee+pro+5+raw+plugin'. This indicates the document's primary purpose is to redirect users to a potentially harmful site. The presence of a large number of external PDF links, many hosted on Shopify, further supports a link-farming or redirection 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.me/wix?keyword=acdsee+pro+5+raw+plugin
    • https://cdn.shopify.com/s/files/1/0440/4169/9478/files/visukubadazufud.pdf
    • https://cdn.shopify.com/s/files/1/0439/0594/1672/files/advent_of_ascension_skill_guide.pdf
    • https://cdn.shopify.com/s/files/1/0458/0527/3254/files/badrinath_movie_naa_songs.pdf
    • https://cdn.shopify.com/s/files/1/0435/5552/0667/files/ice_cream_maker_wooden_bucket_manual.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_ee7f832472b34dcb931971088e00757b.pdf
    • https://static.usrfiles.com/ugd/cf14a4_6452dcd8a3a641b482d7d6523aaaf7f5.pdf
    • https://cdn.shopify.com/s/files/1/0448/3615/9645/files/xumusaguw.pdf
    • https://cdn.shopify.com/s/files/1/0428/4160/4263/files/27053988726.pdf
    • https://cdn.shopify.com/s/files/1/0437/3849/7185/files/11955996654.pdf
    • https://cdn.shopify.com/s/files/1/0434/3880/1061/files/fosukokogi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3967/7861/files/20966346547.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_off00006fe3.bin
81a2fce3a044251aefd9e4c7ae095113cc08dcf6019fea367b68444fb932b31f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE3 5448 bytes
font_01_sfnt_off0000828f.bin
677cd4c62188c1de5dadfa1a78fea3a172766898dd00bb829e3be494c4604525
pdf-font-stream PDF embedded font (sfnt) at offset 0x828F 15440 bytes