Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a869e6cf260c554…

MALICIOUS

PDF

47.4 KB Created: 2020-07-15 09:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb13c680965f052aab2e0a8b1b597ac8 SHA-1: 738f0c6eb1c30baf128ec023662b389b0bcdc04e SHA-256: 2a869e6cf260c554ca93694bc17f1e351beb6ee2dccbd71bf3d0e002992f1b3f
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF file was flagged by multiple critical heuristics as malicious, including a malicious redirector link and a general ML classifier indicating high maliciousness. The embedded URL points to a redirector service, suggesting an attempt to funnel users to a malicious site. The document body, though heavily obfuscated, contains text related to a 'Volkswagen Jetta manual', which serves as a lure. The ClamAV detection 'Pdf.Dropper.Agent-9537904-0' further confirms its malicious nature as a dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • ClamAV: Pdf.Dropper.Agent-9537904-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9537904-0
  • 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/wb?keyword=volkswagen%20jetta%202014%20manual
    • http://files.pianolessonsbyjulie.com/uploads/1/3/1/3/131380868/59baef08.pdf
    • http://files.gruuvtech.com/uploads/1/3/2/8/132814900/721644fcf4dc1d.pdf
    • http://files.1stcallrepairsandparts.com/uploads/1/3/2/8/132814900/1399110.pdf
    • https://rabedebeg.files.wordp
    • https://cdn.shopify.com/s/files/1/0432/1627/3563/files/88831528933.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/44386166303.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98973723668.pdf
    • https://tutinofokuke.files.wordpress.com/2020/07/28935519496.pdf
    • https://sazexaki.files.wordpress.com/2020/06/32935194168.pdf
    • https://rabedebeg.files.wordpress.com/2020/07/25778670162.pdf
    • https://vemerow.files.wordpress.com/2020/07/duwasirovafat.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89832202682.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1072/files/48750838850.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/naxinisetejiredomox.pdf
    • https://cdn.shopify.com/s/files/1/0430/1019/5605/files/54511600657.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dofupuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/fexit.pdf
    • https://cdn.shopify.com/s/files/1/0433/3823/6062/files/semikur.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_off0000763a.bin
32e4449f419fc06361b2a67ec263c3ff31f7e39602b5e05b566a3e7c86334afb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x763A 5356 bytes
font_01_sfnt_off0000888b.bin
efa32bfa7251782c6f6a582e5fa50c94987ff1abcc9770a9f8c26d1f378e1a9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x888B 12860 bytes

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