Malicious PDF — malware analysis report

Static analysis result for SHA-256 e404b5fe254e46cc…

MALICIOUS

PDF

34.0 KB Created: 2020-09-01 07:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfb0728c7c92fde613f78460dbbd9849 SHA-1: 007b9d7a1f0149b22872865a76996c71b6aa9d72 SHA-256: e404b5fe254e46cc2afbc22dc108deb2b5ccab53e5a0d22465829661626e4a65
152 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to malicious infrastructure, specifically a link related to a freezer manual search. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this behavior. The presence of numerous other PDF links suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly indicates malicious intent.

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.cc/wix?keyword=amana+upright+freezer+manual
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/41582711489.pdf
    • https://cdn.shopify.com/s/files/1/0432/7889/3214/files/adrienne_rich_compulsory_heterosexuality.pdf
    • https://cdn.shopify.com/s/files/1/0435/5306/3063/files/36062611955.pdf
    • https://cdn.shopify.com/s/files/1/0430/2402/3715/files/vuzebulotipopipekatutiroz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6463/1189/files/23253222265.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8865/files/vifekudimuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/9239/3640/files/jewigubufavikajeton.pdf
    • https://cdn.shopify.com/s/files/1/0429/6821/9799/files/social_psychology_baron_and_branscom.pdf
    • https://static.usrfiles.com/ugd/b8c837_49215ce896c84ea9bc3c71259407e086.pdf
    • https://static.usrfiles.com/ugd/63d3ad_d47b02e9efe24a498485766094e54a10.pdf
    • https://static.usrfiles.com/ugd/30e015_3009559f100d44d6999ba6c86a760077.pdf
    • https://static.usrfiles.com/ugd/b8c837_be0d5c2b105f48e58b12801253f9a994.pdf
    • https://static.usrfiles.com/ugd/90423f_78122bd720bf4b0a84082394ea227b62.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/59526866216.pdf
    • https://cdn.shopify.com/s/files/1/0428/6945/7063/files/visual_studio_2005_redistributable.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_off00004702.bin
f6b2bdf3ecc7b699763c03b9612c6d1ca499c699e6abfba82b70048bc9748c4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x4702 5176 bytes
font_01_sfnt_off0000587d.bin
9e79e3233dd9b37417861acd18f59b5d9b51f876c6e964b3f55bff93efad01b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x587D 10152 bytes