Malicious PDF — malware analysis report

Static analysis result for SHA-256 99079bf5d1310702…

MALICIOUS

PDF

44.4 KB Created: 2020-08-09 21:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1099db0b6cd1b7f3d03dab6777f44fe5 SHA-1: 8408b93845aafdd1108945087d50e3e8c7492d73 SHA-256: 99079bf5d1310702a8ea791f619242937f6bc6b78615736708c5dc533b59d505
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector (ttraff.cc). The ML classifier strongly flagged this PDF as malicious, and heuristic rules indicate it is part of a link farm. The document body, though heavily obfuscated, contains the malicious URL, suggesting the PDF's primary purpose is to lure users to malicious infrastructure.

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=insurable+risks+pdf
    • http://wopewafin.valiquet.com/uploads/1/3/1/4/131453284/6756279.pdf
    • http://files.volunteerpotato.com/uploads/1/3/0/8/130814623/povepavum_komuxoxeg_guwuwuxisuneb.pdf
    • http://supejafa.lilgrayrabbit.com/uploads/1/3/0/8/130874431/5664ef2753cb.pdf
    • https://cdn.shopify.com/s/files/1/0435/9235/1907/files/nazanekewinanafikozef.pdf
    • https://cdn.shopify.com/s/files/1/0431/7138/1405/files/16564660060.pdf
    • https://cdn.shopify.com/s/files/1/0431/2317/9677/files/5x5_risk_matrix.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/13439252915.pdf
    • https://cdn.shopify.com/s/files/1/0429/8083/5482/files/blue_circle_emoji.pdf
    • https://cdn.shopify.com/s/files/1/0432/8839/5936/files/14716285227.pdf
    • https://cdn.shopify.com/s/files/1/0439/9867/5102/files/accounts_payable_interview_questions_in.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/fufakimekefuwijusudi.pdf
    • https://cdn.shopify.com/s/files/1/0438/6832/4005/files/bewipegeni.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3464/files/xabikevolefaxujaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/3816/9498/files/binomial_theorem_tricks.pdf
    • https://cdn.shopify.com/s/files/1/0432/4327/4395/files/33258022573.pdf
    • https://cdn.shopify.com/s/files/1/0431/4664/1570/files/26213062754.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_off00006563.bin
9b863f8aeb527bbfcde1301a6f132e07b4dc28a844edf2e4be9e84f67b46eb27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6563 4868 bytes
font_01_sfnt_off000075d7.bin
911ab442db480e9b9e70bb3758789c7cb921a127affdb7c53a9fb268f64de68c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D7 9612 bytes
font_02_sfnt_off0000968a.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x968A 4324 bytes

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