Malicious PDF — malware analysis report

Static analysis result for SHA-256 012390d64d3cee6c…

MALICIOUS

PDF

46.2 KB Created: 2020-08-03 04:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5ed1e2173d7fcb86ee9587deb72b8b5 SHA-1: 63e64acc7d2cdcf1b3056722f1600b91ed6f9f2c SHA-256: 012390d64d3cee6c4e9d5b991a33193038344a2267e378f928404de1d5d17988
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high ML classifier score and the presence of a critical heuristic indicating it links to known malicious redirector infrastructure. The document body contains numerous embedded URLs, forming a link farm, with the primary malicious URL being https://ttraff.ru/pify?keyword=vcvarsall.+bat+python+3.+4. This suggests the document's purpose is to lure users into clicking these links, likely leading to further malicious content or phishing attempts.

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=vcvarsall.+bat+python+3.+4
    • http://tatipel.cinderellacares.com/uploads/1/3/2/6/132682787/zimumedepap.pdf
    • http://files.northernmichiganlivestock.com/uploads/1/3/0/7/130738836/kawafewafijura-xokadeser-zewufajaremol.pdf
    • http://files.cbweis.com/uploads/1/3/0/7/130740252/dadijerusovilij-kepago.pdf
    • http://files.nadinebertalli.com.au/uploads/1/3/1/4/131483097/259070.pdf
    • http://files.anitaberisha.com/uploads/1/3/1/0/131070173/7920477.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4468/4454/files/fadolux.pdf
    • https://cdn.shopify.com/s/files/1/0432/0906/4607/files/maplestory_demon_avenger.pdf
    • https://cdn.shopify.com/s/files/1/0439/1269/1867/files/wapebi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0058/5632/files/45695421057.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lekefokatonerosabiwifeva.pdf
    • https://cdn.shopify.com/s/files/1/0431/5407/9910/files/nafutaxenefuxepe.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2953/files/31808232750.pdf
    • https://cdn.shopify.com/s/files/1/0431/2327/7973/files/32856339244.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67331216746.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7676/files/57728355893.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5502/files/93020272123.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_off000073cf.bin
d4d3e6631604304a778a41a1150de8eb7b3f6b91c72afab93028c8215f1a09ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73CF 5572 bytes
font_01_sfnt_off000086ce.bin
f37968945884cfa290fc3988ac8539dd1ec1bec892969004afb06cedcc35ec95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86CE 10800 bytes

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