Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc557ec9889255d…

MALICIOUS

PDF

33.9 KB Created: 2020-08-03 11:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f58257feee7c184caf7c8f874502849a SHA-1: 95ded1f919ae3bbb02501006cd67bb8d4e9484c3 SHA-256: 0cc557ec9889255dc524ef78a3a4db2ed3a694042bdb4e254933c8fe71ece006
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector pointing to 'https://ttraff.com/pify?keyword=brahmacharya+sandesh+pdf'. The presence of a large number of external PDF links suggests a link farm or a mechanism to distribute further malicious content. 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.com/pify?keyword=brahmacharya+sandesh+pdf
    • http://files.thepineapplecarriage.com/uploads/1/3/0/7/130776536/loremuduz.pdf
    • http://files.fov.org/uploads/1/3/1/4/131406444/9151970.pdf
    • http://files.mindforyouth.com/uploads/1/3/2/6/132682335/2278414.pdf
    • http://files.fullspectrumdoulacare.com/uploads/1/3/1/4/131408913/f1460.pdf
    • http://vedickranti.in/b
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4111/1716/files/17874929030.pdf
    • https://cdn.shopify.com/s/files/1/0439/5591/2862/files/the_great_courses.pdf
    • https://cdn.shopify.com/s/files/1/0433/6294/3144/files/71885580201.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/rofojoge.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/bijusalulufize.pdf
    • https://cdn.shopify.com/s/files/1/0431/2799/6565/files/tokes.pdf
    • https://cdn.shopify.com/s/files/1/0434/2359/6693/files/gidod.pdf
    • https://cdn.shopify.com/s/files/1/0438/4695/9261/files/devil_may_cry_1_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/1917/3029/files/dexafapiwenuxuzojetav.pdf
    • https://cdn.shopify.com/s/files/1/0432/7437/1235/files/49969918519.pdf
    • https://cdn.shopify.com/s/files/1/0433/7526/3909/files/pevesokirokameken.pdf
    • https://cdn.shopify.com/s/files/1/0432/0008/6180/files/63261136744.pdf
    • https://cdn.shopify.com/s/files/1/0428/7397/9043/files/jejojobaw.pdf
    • https://cdn.shopify.com/s/files/1/0437/1641/1547/files/xubexalenap.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_off000046b1.bin
74e379a75a2d2f4a4129a546abdbac8cf688635e8fae39d11ff3f5ca554e6b4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46B1 5516 bytes
font_01_sfnt_off0000594f.bin
c0d395dd2bc83d605c39d42a36728033f2d31e160bbe7ee93be127cf5ebc3a39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x594F 9824 bytes

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