Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b32bbb1c9958931…

MALICIOUS

PDF

45.4 KB Created: 2020-08-23 21:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db1001eaf7fc63e56524683ac158e463 SHA-1: 2f5b7c398c7a94d5f372b80071102ef93380ed33 SHA-256: 9b32bbb1c99589319fc946ec64eb333a2b96c264138c8b442258a5b148f36c1a
152 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.ru/pify?keyword=act+practice+test+pdf+reading'. The document body, though heavily obfuscated, contains references to 'act practice test pdf reading' and the same redirector URL, suggesting a lure to disguise the malicious intent. The ML classifier also strongly flagged this PDF as malicious. The presence of many links, including those hosted on Shopify, indicates a link farm designed to obscure the ultimate destination.

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=act+practice+test+pdf+reading
    • http://files.exeterthreading.co.uk/uploads/1/3/0/8/130873987/4460060.pdf
    • http://wifagolo.strategicmeetingtech.com/uploads/1/3/2/8/132814942/wesogi.pdf
    • http://xerapolof.sturtmoorbuhunds.com/uploads/1/3/0/7/130776542/mujavufogokej_geguja_kataxo.pdf
    • http://files.mindfulengagment.com/uploads/1/3/1/0/131069824/sebezemedale-gupobufamir-lafukati.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37872338034.pdf
    • https://cdn.shopify.com/s/files/1/0429/0487/9271/files/tikosoziguta.pdf
    • https://cdn.shopify.com/s/files/1/0430/8336/6551/files/25249904632.pdf
    • https://cdn.shopify.com/s/files/1/0429/9938/2170/files/88576465128.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/palobowuvopagobozirud.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8099/files/vesalius_de_humani_corporis_fabrica.pdf
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/free_advanced_christmas_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/46651208326.pdf
    • https://cdn.shopify.com/s/files/1/0464/2449/0136/files/24418510897.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/equations_and_inequalities_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/3716/2657/files/jopabowinuretape.pdf
    • https://cdn.shopify.com/s/files/1/0431/6325/4944/files/fogafaju.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_off00006d19.bin
38bfef6f6ee2f9d8bcaa37749172f868115585f42121a9863679b034fd09a8cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D19 5280 bytes
font_01_sfnt_off00007f18.bin
ec5c0fffdd540eeab1539918dcb8ebf8c6343aaa389f6f579457cae279b303a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F18 12776 bytes

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