Malicious PDF — malware analysis report

Static analysis result for SHA-256 65425627cec9c3a8…

MALICIOUS

PDF

52.8 KB Created: 2020-08-02 21:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04bed587bf547df833ab4b055ad418a0 SHA-1: 64fe78d0f6c0f1005236da2df9b0accd96590015 SHA-256: 65425627cec9c3a83cedeb4aae4dc971a80edcea5b4d554dbe20dca27b4b687c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one identified as a malicious redirector to 'ttraff.com'. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the same redirector URL, suggesting an attempt to lure users to a malicious site. The presence of numerous external PDF links further supports a link farm or redirection strategy.

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=examples+of+poorly+written+instructions
    • http://files.greetersinternational.com/uploads/1/3/1/4/131482926/58c0a4be9192.pdf
    • http://files.nimipuutimt.org/uploads/1/3/1/0/131071256/bitefuzofoxu_suruwubowag.pdf
    • http://files.hopefulplace.com/uploads/1/3/0/7/130739227/4497243.pdf
    • http://files.teenchallengeofnewmexico.com/uploads/1/3/1/3/131378942/7063551.pdf
    • http://files.sweetstopcandy.com/uploads/1/3/2/7/132741029/wozuwat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/9164/6880/files/97914870513.pdf
    • https://cdn.shopify.com/s/files/1/0432/3675/3570/files/97784100680.pdf
    • https://cdn.shopify.com/s/files/1/0433/4203/7150/files/36050760645.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/90766255210.pdf
    • https://cdn.shopify.com/s/files/1/0432/8757/6740/files/72375498954.pdf
    • https://cdn.shopify.com/s/files/1/0433/3826/8827/files/resesixodixozo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2314/6906/files/rawiguvawogevezikuwize.pdf
    • https://cdn.shopify.com/s/files/1/0437/2591/4262/files/zediwidokodifekuzireni.pdf
    • https://cdn.shopify.com/s/files/1/0431/5987/9841/files/veferepuja.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/loxidunadubufurepetiverox.pdf
    • https://cdn.shopify.com/s/files/1/0435/7344/4767/files/wesodunoxorepidagamimen.pdf
    • https://cdn.shopify.com/s/files/1/0435/7029/9038/files/tipirefeluxogot.pdf
    • https://cdn.shopify.com/s/files/1/0432/3888/3485/files/39492912197.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_off00008eed.bin
e384db0af19860a34f7325c6170829c24bf043baf5ddecac98cd1fce8d3382a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EED 5380 bytes
font_01_sfnt_off0000a146.bin
358df9acf884801156fd112c6c1fef66dc019f94024e00744833af33f1345e37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA146 10580 bytes

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