Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1cf5a762db084f…

MALICIOUS

PDF

46.8 KB Created: 2020-08-06 05:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 167f9f6df9c9970ff615f158ff2649cb SHA-1: fe0f04b54fab85a4680df03125913781a199833e SHA-256: 5c1cf5a762db084f3c048dee03f48bf67edc8402d8c6bc816be646ebcf870589
162 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 a link farm designed to host numerous PDF files. One of these links, https://ttraff.cc/pify?keyword=c+language+objective+questions+and+answers+pdf+free+download, redirects to malicious infrastructure, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=c+language+objective+questions+and+answers+pdf+free+download
    • http://files.heartsoultours.com/uploads/1/3/0/7/130775017/ab5a6.pdf
    • http://files.azaleapatricia.com/uploads/1/3/2/7/132740580/kimasikenosivo.pdf
    • http://files.basic23fashion.com/uploads/1/3/0/9/130969485/kuxosadeb-lurol.pdf
    • http://files.rrasurveyors.com/uploads/1/3/0/7/130740490/1674264.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2741/4696/files/15381472544.pdf
    • https://cdn.shopify.com/s/files/1/0428/0628/0355/files/34204150074.pdf
    • https://cdn.shopify.com/s/files/1/0429/6487/7471/files/96249024767.pdf
    • https://cdn.shopify.com/s/files/1/0433/0363/3051/files/mudefinusobixuwudafuponax.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4042/files/19896508731.pdf
    • https://cdn.shopify.com/s/files/1/0432/9740/7126/files/71532871256.pdf
    • https://cdn.shopify.com/s/files/1/0433/0497/6548/files/muxutesedusewuxurazesurad.pdf
    • https://cdn.shopify.com/s/files/1/0431/2976/6039/files/13733690040.pdf
    • https://cdn.shopify.com/s/files/1/0429/3849/9235/files/64109546575.pdf
    • https://cdn.shopify.com/s/files/1/0428/8741/3923/files/josinujatazuwot.pdf
    • https://cdn.shopify.com/s/files/1/0433/8860/0478/files/weluvewidefoxonuxebofir.pdf
    • https://cdn.shopify.com/s/files/1/0435/9074/6271/files/sakiwoxadodebodepozu.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_off00006fa2.bin
cc82732df5e9ed28a4b9679f166cf05e650082cce0944b9d892f943f484a68d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA2 5720 bytes
font_01_sfnt_off00008335.bin
0f25f5b3a7e50e52f5e51e623b9921bce34fe66500db595aacb9ad88ceb3ef98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8335 14048 bytes

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