Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8e837faa18f67f…

MALICIOUS

PDF

35.9 KB Created: 2020-09-17 21:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c421532a91065e22f6f23d2c9be9ce9 SHA-1: 73dad5d15cfb4b833251b75e42a6b2bc8edaa106 SHA-256: 6a8e837faa18f67fbecd873c7b7279db955bde52735e5bc0c529210cbb90de61
162 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.link', which is used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the same redirector URL, indicating its primary purpose is to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.link/wix?keyword=area+and+perimeter+of+compound+shapes+worksheets+year+6
    • http://files.newtongeorgiadems.org/uploads/1/3/0/7/130775679/zativovel-labosirewi-dorolopav-komujolewef.pdf
    • http://files.bdooutlet.com/uploads/1/3/1/0/131069886/sisubiv_bomuwox_sikugora_fabalabubulexi.pdf
    • http://files.shajaceramics.com/uploads/1/3/1/3/131380390/8067003.pdf
    • http://files.washingtonzen.org/uploads/1/3/0/8/130814208/pexojiwakokif.pdf
    • http://sited.tnquarterhorsesales.com.au/uploads/1/3/1/1/131164112/wepabavebot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0ef905c0-ed35-4c1b-bf4e-315adb96420a.filesusr.com/ugd/185c00_a2e7fb3038c240d7a54c7a6b1e8f161e.pdf?index=true
    • https://f60bfd42-8e52-4e9b-b542-436b85a175a5.filesusr.com/ugd/a64c8c_b7512419caec40bbae2467a4b15d247b.pdf?index=true
    • https://dc8d77f8-a6e6-4495-b1d6-0e0d2ceeb47c.filesusr.com/ugd/a43ec6_8b6fd6c46e334b2d98eda94d8327ee44.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0433/4295/4651/files/finish_activity_android_studio.pdf
    • https://cdn.shopify.com/s/files/1/0427/5725/9420/files/wipabolupewezo.pdf
    • https://f9f82adf-9ea5-471c-b7c9-05ba937a2515.filesusr.com/ugd/a9248e_7391b4c3961149afad3ee958e1bfe6b1.pdf?index=true
    • https://c0ff12f9-8f16-4a9b-a662-84315dd9912b.filesusr.com/ugd/fef806_3b0059dc046d4cc9b759135349bc264e.pdf?index=true
    • 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_off00004d8c.bin
711d2e76b3f944acb1b1971dddc38ec0828daaaaa18247c1e1a36f9c3710946e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D8C 5764 bytes
font_01_sfnt_off0000611c.bin
479ed27df42f29616cd05ec1a2464d276b0b38db35158c67b7451bfa0f3dd0b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x611C 9780 bytes

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