Malicious PDF — malware analysis report

Static analysis result for SHA-256 392350a39ba23bac…

MALICIOUS

PDF

52.5 KB Created: 2020-08-10 12:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d77764e6327e1ba7b22d94a64cffc419 SHA-1: 171e04e9a721e0120da727d9a77dd276da4fdddc SHA-256: 392350a39ba23bacd63db040e2b97352cc151ea98d2d9e8fefa950642c88fd75
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to a redirector service (ttraff.cc) which is flagged as malicious. The document body itself is heavily obfuscated but appears to contain the same malicious URL. The ML classifier strongly indicated maliciousness. The primary attack pattern involves luring users to external malicious sites via these embedded links.

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=technology+innovation+definition+pdf
    • http://raren.milesalumniatl.com/uploads/1/3/0/7/130776760/titab_difanisaw.pdf
    • http://files.emilypassman.com/uploads/1/3/0/8/130873851/woliwimomile-jajifik-ketotawe-nijapa.pdf
    • http://files.nickburbey.com/uploads/1/3/2/3/132303269/tovatebi_bekekegugotof.pdf
    • http://files.leuvensgenieter.com/uploads/1/3/1/4/131437702/ginexogip-vipegaxir-taxovanotavaxux.pdf
    • http://files.edgewoodfarms.net/uploads/1/3/1/4/131437766/8a3e1d73.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/php_number_format.pdf
    • https://cdn.shopify.com/s/files/1/0433/1202/1657/files/69971825536.pdf
    • https://cdn.shopify.com/s/files/1/0440/5913/2054/files/jopixasaxa.pdf
    • https://cdn.shopify.com/s/files/1/0437/6703/8109/files/68392913469.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8056/files/english_academic_word_list.pdf
    • https://cdn.shopify.com/s/files/1/0427/8029/5334/files/zoxefovuv.pdf
    • https://cdn.shopify.com/s/files/1/0438/0708/0610/files/mibefulelukesak.pdf
    • https://cdn.shopify.com/s/files/1/0434/5308/7897/files/62279299670.pdf
    • https://cdn.shopify.com/s/files/1/0435/3707/2280/files/jogon.pdf
    • https://cdn.shopify.com/s/files/1/0433/4718/1718/files/jovorexiwomikaledononij.pdf
    • https://cdn.shopify.com/s/files/1/0437/7657/3601/files/15473423185.pdf
    • https://cdn.shopify.com/s/files/1/0434/0681/9477/files/87043585195.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_off0000821e.bin
e1ce65420b8fbe9484c441ddd0fe41a5046f7996d7f46272b91f7eed95dd7c87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x821E 5044 bytes
font_01_sfnt_off0000934a.bin
1b52a86d0635962dbfbf91ed79b035e4bca1e2fcd3ecc840effad91b9338f272		 pdf-font-stream PDF embedded font (sfnt) at offset 0x934A 10452 bytes
font_02_sfnt_off0000b6c2.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C2 4324 bytes

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