Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b3346faa6edafa…

MALICIOUS

PDF

47.6 KB Created: 2020-08-11 16:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76e36fd2cbf5a36498afad86be251767 SHA-1: 395822d5e0701f6adddc64e36c9e1070483e7ee4 SHA-256: 85b3346faa6edafa573681c936801cfa574a17e88158f8e3a50067996bfaa69d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a primary link to a known malicious redirector infrastructure at `https://ttraff.com/pify?keyword=mechanical+advantage+of+a+wheel+and+axle+pdf`. The document body, though heavily obfuscated, contains this URL and other links to PDF files, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=mechanical+advantage+of+a+wheel+and+axle+pdf
    • http://files.manuscriptcritiqueservices.com/uploads/1/3/0/8/130874370/gowilug.pdf
    • http://nirumuk.yorkregionaccidentlawyers.com/uploads/1/3/1/3/131380505/tirobep-rikita-fatupupasizo.pdf
    • http://files.shueyvillechurch.org/uploads/1/3/1/4/131437308/7922178.pdf
    • http://files.radovansebesta.com/uploads/1/3/1/4/131437333/6160723.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2819/3186/files/genuzinikonu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1278/files/zafegemadorekoma.pdf
    • https://cdn.shopify.com/s/files/1/0431/8887/9521/files/celtics_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/82057948586.pdf
    • https://cdn.shopify.com/s/files/1/0432/9956/9829/files/gunono.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27347714529.pdf
    • https://cdn.shopify.com/s/files/1/0438/3526/1085/files/togwotee_pass_webcam.pdf
    • https://cdn.shopify.com/s/files/1/0447/3847/8229/files/apc_smart_ups_2200va_lcd_230v_smt2200i.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/xituxoputenase.pdf
    • https://cdn.shopify.com/s/files/1/0428/5172/9567/files/amharic_love_letters.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006629.bin
247a3ff072aa538bd6116afe0f107ef019e34f2a83fa548a44e0e5d31fa35bac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6629 5368 bytes
font_01_sfnt_off00007888.bin
4332e3daa97f9894d3e10fa43040ec2412cf3ccd448186b0d236c3d258373b0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7888 10272 bytes
font_02_sfnt_off00009bf1.bin
ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BF1 16060 bytes

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