Malicious PDF — malware analysis report

Static analysis result for SHA-256 a232b5728a75d0ff…

MALICIOUS

PDF

64.5 KB Created: 2020-08-22 10:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d2d0debf52aadf7a3ee2627d7be894f SHA-1: 713de6f89c82cd70fb36d7e222896621bd65055c SHA-256: a232b5728a75d0fff55890e458a4571b4bb8d3fe3b6146130c24faeae330d053
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a malicious payload. The document body also contains numerous links to external PDFs hosted on Shopify, suggesting a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=apus+launcher+old+apk
    • http://jozebulo.school.st-phil.org/uploads/1/3/1/4/131406437/ebf8269f323541.pdf
    • http://files.mrstrizz.com/uploads/1/3/1/4/131437307/vofapi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6464/7077/files/17030706851.pdf
    • https://cdn.shopify.com/s/files/1/0430/0872/1045/files/puvokugatonumujatu.pdf
    • https://cdn.shopify.com/s/files/1/0465/1450/3830/files/hearthstone_tombs_of_terror_reno_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/6770/2432/files/media_player_codec_pack_softpedia.pdf
    • https://cdn.shopify.com/s/files/1/0449/5153/5771/files/58532962428.pdf
    • https://cdn.shopify.com/s/files/1/0437/6877/4807/files/fejijetegori.pdf
    • https://cdn.shopify.com/s/files/1/0431/0558/3266/files/88430895079.pdf
    • https://cdn.shopify.com/s/files/1/0439/3612/0990/files/city_of_heroes_mastermind_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/7543/6698/files/dajotago.pdf
    • https://cdn.shopify.com/s/files/1/0432/5995/3312/files/cadence_allegro_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0454/files/79962997612.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3457/files/gegisebadoro.pdf
    • https://cdn.shopify.com/s/files/1/0429/1087/5815/files/47154366764.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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off0000ce00.bin
3652692dc8363bd80dc8cb3c97f731f1fa502bc4c89ebc7d7f0d9c7049fc0221		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCE00 17380 bytes
font_00_sfnt_off00006626.bin
730fbbe46c85d774509958a60d8c738a208ef310dc1de408d60b362d87e93953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6626 5628 bytes
font_01_sfnt_off000079d2.bin
fde16ab79b0c61f2b666b798e5c20c8690a40c53aac9d096dccd576f299e85fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79D2 5212 bytes
font_02_sfnt_off00008b6b.bin
c8cb303e765c67f43d6d34f29c1d02953890772ff7b697be779fb29335000f72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6B 6640 bytes
font_03_sfnt_off00009d02.bin
071c34648cdce17f73f267ff58c6989cf23350762f36a618ca436088068297f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D02 2468 bytes
font_04_sfnt_off0000a832.bin
42edf723f518a80b6bbda447a6441d7360bbeee597514b15d873dfd61677b284		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA832 11728 bytes
font_06_sfnt_off0000e7ef.bin
ab0b30550c16f0218ea180a56450acc25083be48fb805cb0f6f475dfa13b8319		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EF 2832 bytes

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