Malicious PDF — malware analysis report

Static analysis result for SHA-256 4232e928f9ded9ae…

MALICIOUS

PDF

57.5 KB Created: 2020-08-19 01:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7ec782de519fdcfc09c2bea303f255d SHA-1: f458a4e98fcc0492224d6ca69bda57286e9541a8 SHA-256: 4232e928f9ded9ae6ea28bc8d2337a306d95083f77e14e13159a088c96f7abad
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Another critical heuristic indicates a PDF link farm, with one of the URLs being 'cdn.shopify.com/s/files/1/0438/1969/6290/files/bajovifixifaramatot.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the malicious URL, suggesting a lure to external content.

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=phool+aur+angaar+film+song
    • http://lijikora.livejoy.org/uploads/1/3/1/4/131453109/6e9e66f268e9f5.pdf
    • http://files.bhbrilliantminds.org/uploads/1/3/0/7/130738710/netexafunuti.pdf
    • http://files.sevendevils.org/uploads/1/3/1/1/131164046/72544.pdf
    • http://kusow.bucketsforjesus.org/uploads/1/3/0/7/130740178/jobipivadodalasabo.pdf
    • https://cdn.shopify.com/s/files/1/0438/1969/6290/files/bajovifixifaramatot.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98048873934.pdf
    • https://cdn.shopify.com/s/files/1/0436/6503/1321/files/ukulele_chords_songs.pdf
    • https://cdn.shopify.com/s/files/1/0431/9933/2516/files/9912762063.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0357/files/81843139110.pdf
    • https://cdn.shopify.com/s/files/1/0438/6881/5528/files/93918341981.pdf
    • https://cdn.shopify.com/s/files/1/0439/4074/1275/files/xuzomukafitato.pdf
    • https://cdn.shopify.com/s/files/1/0435/4516/5976/files/utah_vehicle_bill_of_sale.pdf
    • https://cdn.shopify.com/s/files/1/0435/4041/4615/files/1572483740.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009b2c.bin
e4a3eb8fb1c0d81b14704418e7c5d078f0de8327f588a37985d086354d39f247
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B2C 5184 bytes
font_01_sfnt_off0000aca2.bin
5cdcae9ba7e38347d0c68c3f773a1d456fe6ac6975c3373cf7bf1c87dbc8e756
pdf-font-stream PDF embedded font (sfnt) at offset 0xACA2 14312 bytes