Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b164787048cd142…

MALICIOUS

PDF

43.4 KB Created: 2020-08-10 16:40:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2598dc4bfb235b267a0f63ac54f0e026 SHA-1: 42737c43f4da7d9160dd6c3f871c247a83c7104a SHA-256: 3b164787048cd142b5ee21d1b31807d90b47510cb4e52893ec35a7bf711339e5
154 Risk Score

Malware Insights

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

The PDF document was flagged by a critical heuristic for containing links to known malicious redirector infrastructure, specifically 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The document body contains the same URLs, suggesting a deliberate attempt to distribute these links. The primary malicious URL is 'https://ttraff.ru/pify?keyword=number+line+to+1000+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.ru/pify?keyword=number+line+to+1000+pdf
    • http://files.saloneco.net/uploads/1/3/1/3/131380183/warazobikiremow.pdf
    • http://files.bostonbollywood.com/uploads/1/3/1/4/131483336/9819968.pdf
    • http://files.campfido.com/uploads/1/3/1/8/131856232/78029.pdf
    • http://files.scienceadventureprogram.com/uploads/1/3/1/3/131380308/towaka.pdf
    • https://cdn.shopify.com/s/files/1/0436/7004/4825/files/instagram_password_hack.pdf
    • https://cdn.shopify.com/s/files/1/0431/5670/1348/files/rusinixobelum.pdf
    • https://cdn.shopify.com/s/files/1/0439/4716/3806/files/pfp_for_discord.pdf
    • https://cdn.shopify.com/s/files/1/0429/7719/8229/files/fotelibopujazasifamewe.pdf
    • https://cdn.shopify.com/s/files/1/0433/4796/8149/files/capteur__effet_hall_principe_de_fonctionnement.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/datudiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/4329/8207/files/intel_xtu_profiles.pdf
    • https://cdn.shopify.com/s/files/1/0437/9780/7265/files/51699204243.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/gozoloxexinirefawajujogim.pdf
    • https://cdn.shopify.com/s/files/1/0431/8406/2622/files/balance_score_card_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/0839/3367/files/xovak.pdf
    • https://cdn.shopify.com/s/files/1/0434/1802/6142/files/xivepamejiketukafepos.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f3f.bin
819d095204b04398ac0c14cd8579acb39c63b98719aef7cad62d09a6151a559a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3F 4984 bytes
font_01_sfnt_off00007012.bin
1928f4049a3e4d5113a025a2b32f3ee5ad82ec82fcdd339b0f27ca8296342ec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7012 10044 bytes
font_02_sfnt_off00009260.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9260 4324 bytes

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