Malicious PDF — malware analysis report

Static analysis result for SHA-256 d584809e4ac8eba7…

MALICIOUS

PDF

50.6 KB Created: 2020-08-20 10:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38f5a231904b67ad92691f45bda2b8fd SHA-1: edf1683df7b01d7a101f3cdfec230532322dc0b1 SHA-256: d584809e4ac8eba73493a198a3a4751a12c329c9b3049d7c1cfeb65d5e564e4e
152 Risk Score

Malware Insights

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

The PDF file contains embedded links that point to a known malicious redirector. The document body, though heavily obfuscated, appears to contain keywords related to cloud services, likely as a lure. The primary heuristic indicates the PDF links to known malicious redirector infrastructure, and a machine learning model also flagged it as malicious. The embedded URL is the highest priority IOC.

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=s3+bucket+retention+policy+cloudformation
    • http://files.meadowsonfairview.org/uploads/1/3/0/8/130874205/xatejuwotitig.pdf
    • http://files.rayewood.net/uploads/1/3/0/7/130775772/xexezulumodalow_wesowibigox_mejudarinemup_zelikefamuxemux.pdf
    • http://xoveg.bigwhitebarnyoga.com/uploads/1/3/2/6/132681352/1e719c6d106f6d2.pdf
    • http://fukudujit.dundasseacadets.com/uploads/1/3/1/3/131384605/59952dbf92.pdf
    • https://cdn.shopify.com/s/files/1/0433/0648/3876/files/fofobokofos.pdf
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/40839952081.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84602765162.pdf
    • https://cdn.shopify.com/s/files/1/0433/8447/1719/files/nidupikanufalow.pdf
    • https://cdn.shopify.com/s/files/1/0437/8034/1917/files/pioneer_eeq_mosfet_50wx4_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/7512/5923/files/jeunesse_dore_reportage.pdf
    • https://cdn.shopify.com/s/files/1/0436/3993/1033/files/60909610381.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_off00007cbc.bin
b3fc71139c9f8fe831a7344b31ad616deb8ec49b88b6369b75cd5a45750fef6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CBC 5696 bytes
font_01_sfnt_off00009011.bin
7e8102ea6c1fed0477a816f9ae5a690b666b559634aa6ad3a4bbd5dc4bca36ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9011 14656 bytes

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