Malicious PDF — malware analysis report

Static analysis result for SHA-256 0029d2a7b4b7772f…

MALICIOUS

PDF

39.2 KB Created: 2020-08-20 21:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23fe5a8093ba9ae3633b41fce448ddb3 SHA-1: 9df7c3a9d2ed712575178204b97b18fc0ea607a6 SHA-256: 0029d2a7b4b7772fdd7a43b9ab0185bb20143b3c54b0e6ee1d6ac8a0b7c2c063
154 Risk Score

Malware Insights

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

The PDF document contains a link to a malicious redirector, ttraff.cc, which is designed to lead users to potentially unwanted software. The document body and embedded URLs suggest a lure related to downloading software, specifically mentioning 'betternet premium version apk'. The presence of a large number of external PDF links further indicates a link farm or SEO manipulation tactic.

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/pify?keyword=betternet+premium+version+apk
    • http://files.newworldexploration.com/uploads/1/3/1/6/131637546/wifonafinebonir.pdf
    • http://files.worldmemories.org/uploads/1/3/1/3/131383358/606d5fb.pdf
    • http://files.bensonstreetstudio.com/uploads/1/3/0/7/130739831/4659f8.pdf
    • http://gawowu.nushagakfurcompany.com/uploads/1/3/1/0/131070786/4427135.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4517/5971/files/74676548576.pdf
    • https://cdn.shopify.com/s/files/1/0437/3869/3797/files/68853136085.pdf
    • https://cdn.shopify.com/s/files/1/0432/1266/9089/files/widarebovaletasavikotag.pdf
    • https://cdn.shopify.com/s/files/1/0429/7487/1711/files/caries_classification.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3142/files/ledaboloviwoje.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/kikuvosuwexub.pdf
    • https://cdn.shopify.com/s/files/1/0432/0873/6928/files/excel_spreadsheet_for_macbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/2303/1720/files/gudumowagepupepefatefuzal.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_off00005d88.bin
6a86f88cafe07b87d0b684dbbddec8aa1ebaadea9c76566d503eae49ee7b655a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D88 5104 bytes
font_01_sfnt_off00006ed3.bin
6d4999744b4a88d7813e2e95442171dd817e2a0edbfd7f4f7fc39a8ca08adf59
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED3 9764 bytes