Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac883552a672685…

MALICIOUS

PDF

39.3 KB Created: 2020-08-30 01:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d79270f7caf1736395eb450b06219ba SHA-1: 1d043cd01ba6e5c7fb65016f3017516430a304a2 SHA-256: aac883552a672685f77483ca88bd806848c987541e6bde99765ce1c129025bcd
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggered this finding. The presence of numerous external links, many pointing to Shopify, suggests a link farm or SEO manipulation tactic to distribute malicious 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.ru/wix?keyword=media+and+culture+11th+edition
    • https://cdn.shopify.com/s/files/1/0433/9613/7111/files/27505363123.pdf
    • https://cdn.shopify.com/s/files/1/0438/6953/6411/files/65895071086.pdf
    • https://cdn.shopify.com/s/files/1/0438/8611/7019/files/47978644325.pdf
    • https://cdn.shopify.com/s/files/1/0429/3473/0911/files/60606976796.pdf
    • https://cdn.shopify.com/s/files/1/0435/4677/1607/files/bixupavul.pdf
    • https://cdn.shopify.com/s/files/1/0427/8750/4294/files/the_last_remenant_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0460/7862/3908/files/59855590307.pdf
    • https://static.usrfiles.com/ugd/51c472_e904023698ea4e8eafd5f8e4fb1a98de.pdf
    • https://static.usrfiles.com/ugd/5899d5_612b00336a06441a85715f66ba681dc4.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f825cf65625495496c79e78b526030c.pdf
    • https://static.usrfiles.com/ugd/4ae4db_8d81c557c4134b4d90821b7d75523375.pdf
    • https://static.usrfiles.com/ugd/d54300_1c1eb48338ea49078c26f3c5e251540d.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_off00005db9.bin
a8d35d48b9f8de4b67c0b509b2d6ca893492dbcc090f46e30fe0e712e7b60aec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB9 4904 bytes
font_01_sfnt_off00006e5e.bin
5101893ec58e2bea0f5e3769c992e7dbf370ebfd05f9de54dd676ce38d667608		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E5E 9976 bytes

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