Malicious PDF — malware analysis report

Static analysis result for SHA-256 19daf1080cd06d76…

MALICIOUS

PDF

46.1 KB Created: 2020-08-24 00:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bc57d7412abd8537df1a20db3a57023 SHA-1: 1edb9af372f7f78a5ea8fbe53484b3cb7106555a SHA-256: 19daf1080cd06d76b3fd3c2a87f0d8f4509e01e0da2268f8f5f7267149cc3e46
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=unity+asset+store', suggesting a lure related to the Unity asset store. The presence of a large number of external PDF links also indicates a link farm, a common tactic for SEO poisoning or distributing malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=unity+asset+store
    • http://files.creaturesgrimm.com/uploads/1/3/2/7/132712119/gidofaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/91578949750.pdf
    • https://cdn.shopify.com/s/files/1/0437/6992/1688/files/mozifezefavobafimumi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9232/9119/files/vugululipenanezi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5876/4696/files/triangle_movie_imdb_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/7628/7645/files/sound_engineering_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0432/6824/3624/files/dutabegubib.pdf
    • https://cdn.shopify.com/s/files/1/0439/5397/9550/files/xupefiwojit.pdf
    • https://cdn.shopify.com/s/files/1/0439/7400/0798/files/juzovubifanidiz.pdf
    • https://cdn.shopify.com/s/files/1/0432/4874/6651/files/graft_polymerization.pdf
    • https://cdn.shopify.com/s/files/1/0434/4931/9577/files/lamborghini_song_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0434/2949/4936/files/sza_broken_clocks_video.pdf
    • https://cdn.shopify.com/s/files/1/0432/9753/8203/files/sofogoguwa.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_off0000772c.bin
9ffd721d75bc13df790a0544ca1e3e307be026efbbaa6ada4e9996aa4a6985d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x772C 4740 bytes
font_01_sfnt_off00008758.bin
ea173eaae532792b86054f1cf5f199dd3e1a1202c504787cf387dcd7d4d7a527
pdf-font-stream PDF embedded font (sfnt) at offset 0x8758 10616 bytes