Malicious PDF — malware analysis report

Static analysis result for SHA-256 785fb4cabd9f674b…

MALICIOUS

PDF

42.9 KB Created: 2020-08-14 07:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 967bfe3e3099faba1e305af506a0c546 SHA-1: 3a78621dfe2789e568c35959c84518782098075c SHA-256: 785fb4cabd9f674b39e0912f652e5875f96ebad6669fbe5fe0f85ddc722452c0
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/wb?keyword=dissociative%20disorder%20book%20pdf'. This indicates the document is designed to redirect users to malicious sites, likely for further exploitation or phishing. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly suggest a phishing or malware distribution attempt.

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.cc/wb?keyword=dissociative%20disorder%20book%20pdf
    • http://files.trnwestchester.org/uploads/1/3/1/3/131379700/remabaravuf.pdf
    • http://majutive.journeyoftrust.net/uploads/1/3/1/6/131636644/3266152.pdf
    • http://rizida.odpeople.com/uploads/1/3/2/6/132683169/dufiseruve_nefat_wufitedufuwujo.pdf
    • http://files.emermarymorris.com/uploads/1/3/1/4/131406780/ganosevexorotu.pdf
    • http://buvidekim.drbobstem-ed.net/uploads/1/3/2/7/132740930/gagubi-nasogawemano-pidigikagamofo-gixelesunodan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3225/5392/files/kiditujowefeparorivow.pdf
    • https://cdn.shopify.com/s/files/1/0440/5500/3286/files/gorared.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bodadajigewodozisidezufe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4336/4759/files/puvamofimozenulo.pdf
    • https://cdn.shopify.com/s/files/1/0435/0004/4454/files/latest_javascript_tutorial_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6147/6504/files/27739459319.pdf
    • https://cdn.shopify.com/s/files/1/0429/4528/2214/files/61930922709.pdf
    • https://cdn.shopify.com/s/files/1/0432/3006/8894/files/18194727036.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/34509237411.pdf
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/nazitelav.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/24028012216.pdf
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/19762182881.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38659434623.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_off000069dc.bin
a756cbfc9bad63209713a226b97accf4bc304f9861e6d3c3128f681426f69af1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69DC 5380 bytes
font_01_sfnt_off00007c3e.bin
6572a2637b00da80e5d9d293d2fe6eb9733d716f783a598e672171a6c6e8891a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3E 10076 bytes

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