Malicious PDF — malware analysis report

Static analysis result for SHA-256 27281515e68fe0db…

MALICIOUS

PDF

50.6 KB Created: 2020-08-04 14:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f8e65331bb9e420e8ae32b4288f336b SHA-1: 3e0592ed76d67407de4bcb7432247f59995cc537 SHA-256: 27281515e68fe0dbd5bbcb05adb696793601e591bcdce51142a1d135e54f7791
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains commonly used for hosting malicious content or redirecting to it. One critical heuristic identified a link to a known malicious redirector, 'ttraff.cc', which is designed to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the attack pattern.

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=basal+ganglia+bleed+pdf
    • http://files.tonchairs.com/uploads/1/3/0/9/130968947/29632ed.pdf
    • http://files.metrodetroitreview.com/uploads/1/3/0/8/130873840/9863710.pdf
    • http://files.muckypupspreschool.com/uploads/1/3/2/6/132696029/nitedej_satejexefu_tadasulowu.pdf
    • http://wotuzezun.anxietyannarbor.com/uploads/1/3/0/9/130969754/wejogivatunog_funaw_xuximiwejiv.pdf
    • http://files.thelearningkirb.com/uploads/1/3/1/3/131380616/kowufazujemojaf-fexifanam-rozowap.pdf
    • https://cdn.shopify.com/s/files/1/0429/7129/9999/files/d_d5e_monster_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5138/files/4505532566.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4602/files/mutizut.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0758/files/zumejimofi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7995/8679/files/79310094335.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2119/files/legagexu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3182/1468/files/504_country_code.pdf
    • https://cdn.shopify.com/s/files/1/0429/3437/0470/files/guroxotadufiroxebal.pdf
    • https://cdn.shopify.com/s/files/1/0429/5727/5299/files/zoxarosogumasalorusex.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ruxejuvekega.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2452/files/gigamovitiwivuli.pdf
    • https://cdn.shopify.com/s/files/1/0434/3863/7208/files/50555107734.pdf
    • https://cdn.shopify.com/s/files/1/0439/0112/4760/files/mufokukarulaxafuwipejuw.pdf
    • https://cdn.shopify.com/s/files/1/0429/3804/0487/files/wepuzu.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_off00007927.bin
fb6fe9ad98ffdcea3a19767d159a4205e8123eddfb0ca7b4a01718a4f5cfc4c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7927 5304 bytes
font_01_sfnt_off00008b46.bin
1db6178687faaeb72c32085ea64167c14f174fb1d24378af46479f55b16522d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B46 15684 bytes

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