Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bcce2808e5fba5…

MALICIOUS

PDF

42.6 KB Created: 2020-08-01 15:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27b4f47fdeee6a6316e30b1a5ddfdf4c SHA-1: 97ba1c7aae47587ca3ee40bbd25aadf9ec085f96 SHA-256: c1bcce2808e5fba56c13a419e1751a9ab3f3d54f5003fdf669d566e30cae530b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though obfuscated, contains text related to 'P90x classic workout schedule pdf' and the malicious URL, suggesting a lure. The primary malicious URL is https://ttraff.ru/pify?keyword=p90x+classic+workout+schedule+pdf, which is likely used to redirect users to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=p90x+classic+workout+schedule+pdf
    • http://files.maschmeyer.com/uploads/1/3/1/3/131378838/putedogovo-piretelaso-bonuwezi.pdf
    • http://files.zapmobileentertainment.com/uploads/1/3/0/7/130775346/fd4754.pdf
    • http://files.mpowercfcf.com/uploads/1/3/1/4/131407292/8584150.pdf
    • http://files.silverstormfarm.com/uploads/1/3/0/7/130740231/8451747.pdf
    • https://cdn.shopify.com/s/files/1/0432/7283/1134/files/xevufisurededadewara.pdf
    • https://cdn.shopify.com/s/files/1/0433/9476/0862/files/46643570785.pdf
    • https://cdn.shopify.com/s/files/1/0432/9557/2126/files/90762337277.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17844710077.pdf
    • https://cdn.shopify.com/s/files/1/0432/0277/3156/files/wejobov.pdf
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/24965941485.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/tevewitowizazuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39858795743.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/zefexedodod.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49186839350.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6652/files/ruduviwimilak.pdf
    • https://cdn.shopify.com/s/files/1/0432/2630/0577/files/71969250481.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lovukapovilelogitolosir.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/febuxevabotesidimegug.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_off000067b5.bin
ac488ec3db24a7e4d8f866218fb6360e16d12e9d14a14cd0f2bcec50f92ff35f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B5 5768 bytes
font_01_sfnt_off00007b69.bin
c28fd249edfcca458db9531e58369ce7302d29744cd2d42796fb19debfd27a38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B69 9908 bytes

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