Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e16227c83d0b18…

MALICIOUS

PDF

36.7 KB Created: 2020-08-18 23:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15ba3520275a69cd2d437642630ae655 SHA-1: b461f6d174a364864073f4623981de7ba6a69f47 SHA-256: 08e16227c83d0b18cd52462fb4d95ab1a5dbcb26ca44940ce278fb4d520b6f84
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.cc', which is used to obscure the final destination. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=atomic+structure+book+pdf', indicating a lure for users interested in 'atomic structure book pdf'.

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=atomic+structure+book+pdf
    • http://files.liferenewalcounseling.org/uploads/1/3/1/4/131452824/cd119220ee.pdf
    • http://lebimisiz.ecwriter.com/uploads/1/3/0/8/130874222/3eb8e.pdf
    • http://files.rt19produceauction.com/uploads/1/3/0/7/130775677/senelajeke.pdf
    • http://files.cincycreationsllc.com/uploads/1/3/1/4/131453067/bumupo-libeloridusan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/wiporujovekebutebilaji.pdf
    • https://cdn.shopify.com/s/files/1/0439/9942/8766/files/70971551561.pdf
    • https://cdn.shopify.com/s/files/1/0440/5487/2214/files/60130555130.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9048/files/negewezopegosifi.pdf
    • https://cdn.shopify.com/s/files/1/0440/5441/3462/files/75118307233.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11783771814.pdf
    • https://cdn.shopify.com/s/files/1/0429/7952/4759/files/how_to_download_video_from_pornhub.pdf
    • https://cdn.shopify.com/s/files/1/0429/5655/4394/files/rofepofu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8418/4728/files/bleak_house_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/zafijewopisikumox.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5737/files/rorazejovapapaguwixe.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_off000050f4.bin
6f087a8daea951398d09e26009f202e087a124f090b6f3bc0d262e22ba2ecb4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50F4 5252 bytes
font_01_sfnt_off000062be.bin
8a0cfaeec86e32871834dc558c0a7c5250cde8abbe4215ad6945266ebe3d2a08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62BE 10468 bytes

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