Malicious PDF — malware analysis report

Static analysis result for SHA-256 5023432c0446a794…

MALICIOUS

PDF

38.0 KB Created: 2020-08-29 01:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d52e5f535a54ee44174b4ad2a301e21d SHA-1: 49a69545d0a2500edc3ad0beda43852499c07c27 SHA-256: 5023432c0446a7946518370b33a27bd2acc7c8556a008af9aa28ea6f4ade4780
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=dyson+operating+manual'. This URL is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on Shopify, suggesting a link farm or SEO poisoning tactic to increase visibility. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=dyson+operating+manual
    • https://cdn.shopify.com/s/files/1/0429/4567/5420/files/craveable_keto_cookbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/6850/5764/files/12989473233.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/vojadi.pdf
    • https://cdn.shopify.com/s/files/1/0440/9714/2936/files/1540226842.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/34659832250.pdf
    • https://static.usrfiles.com/ugd/b8c837_95974da338b44178b93cc0bcdc4fb312.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7cb16004dc34b68829adf39274f820c.pdf
    • https://static.usrfiles.com/ugd/b8c837_373ce20d6860424db49265a61ef8f6a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7fb09465e844f60a5f78eeb576c7fdd.pdf
    • https://cdn.shopify.com/s/files/1/0437/5419/3047/files/59082512145.pdf
    • https://cdn.shopify.com/s/files/1/0431/1826/4469/files/operating_system_concepts_with_java_8th_edition_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0463/3365/7243/files/ciencia_formal_definicion_y_ejemplos.pdf
    • https://cdn.shopify.com/s/files/1/0457/6067/5996/files/guyton_and_hall_13th_edition_free_do.pdf
    • https://cdn.shopify.com/s/files/1/0432/9776/7592/files/24079011782.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/vorefinesomefobaxid.pdf
    • https://cdn.shopify.com/s/files/1/0434/1848/4888/files/karivagak.pdf
    • https://cdn.shopify.com/s/files/1/0431/7865/5903/files/nidasinoduzevub.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_off00004df7.bin
4e5a2485fbcffe12d9621e371872d981a418116a3b4fae3817efd8447affcfc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DF7 5240 bytes
font_01_sfnt_off00005fb9.bin
ccc2c619ee583cfdb738bdd6ffa09afa90b25378dc2e2a5c6adbfbda602782ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB9 13332 bytes

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