Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ada1423bb2a33c…

MALICIOUS

PDF

42.6 KB Created: 2020-08-10 00:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3082254cf6b248ea6d333fd1b9c23e11 SHA-1: 41af14cbc7ab5e3f8879d6784b095a1fe5cd4930 SHA-256: 66ada1423bb2a33c02772eea4bfbdd7147aff3c61d495db8985e673f88189209
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, a technique often used for SEO poisoning or to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were extracted, the presence of embedded URLs and the ML classifier's high confidence suggest a malicious intent to redirect users to harmful sites.

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=alimentos+ricos+en+calcio+no+lacteos+pdf
    • http://files.coyotekidz.com/uploads/1/3/2/6/132695213/bawuvekod.pdf
    • http://files.mendingspirits.org/uploads/1/3/1/1/131164081/zibawiroxotox_zibedudediwesu_japewisojasefe.pdf
    • http://files.hereamiafrica.com/uploads/1/3/1/6/131606011/lanidolov.pdf
    • http://files.iamphoto.co.uk/uploads/1/3/0/9/130969241/gorenorowi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0446/6386/5497/files/advantages_and_disadvantages_of_parliamentary_system.pdf
    • https://cdn.shopify.com/s/files/1/0428/2531/8563/files/23882761827.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/99481912119.pdf
    • https://cdn.shopify.com/s/files/1/0430/7389/6602/files/experience_psychology_3rd_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5866/7430/files/convert_seconds_to_milliseconds.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6857/files/99359853417.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45397061855.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/35519441185.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89089693040.pdf
    • https://cdn.shopify.com/s/files/1/0429/5373/6351/files/pokewapamikisubabolitufag.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/31469175440.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006500.bin
8888f18b75348f6c04b064b3ee1ffe624c85509b370c6b8c0fb655425e1ce04c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6500 5288 bytes
font_01_sfnt_off000076e6.bin
7cce9ec8ca7bbe06025ac3a592bd90406208992bae81fbdf92bac5d791d03c88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E6 11348 bytes

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