Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4cafb9bfdfcb8c2…

MALICIOUS

PDF

37.0 KB Created: 2020-08-29 12:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f625e051422451617e2744e0f22b891a SHA-1: bf40c7ceed95fe6c0a5f911ab21082408b96e40c SHA-256: f4cafb9bfdfcb8c222e12876aea178bff5169c349266b7033e2c2d0648933809
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, indicating a phishing or malware distribution attempt. The document body contains the text "Facial abuse download" and the URL "https://ttraff.ru/wix?keyword=facial+abuse+download", which is flagged as malicious. The presence of numerous PDF links, many hosted on Shopify and static.usrfiles.com, suggests a link farm designed to improve search engine ranking for malicious content or to obscure the ultimate destination.

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=facial+abuse+download
    • https://cdn.shopify.com/s/files/1/0430/7448/6421/files/20273819776.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5312/files/40722993967.pdf
    • https://cdn.shopify.com/s/files/1/0428/5667/7543/files/29747052190.pdf
    • https://static.usrfiles.com/ugd/b8c837_045c7a683e3b4c32bcab05f62dbaa407.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c9ead366ad049acb54cf6dcdfd65814.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ad786902dad40529b6f5a4242697e70.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8bec08b0a62465bb2743586959c450c.pdf
    • https://static.usrfiles.com/ugd/b8c837_15d987383e264efbaaf12855d5cf5ee2.pdf
    • https://cdn.shopify.com/s/files/1/0430/8526/7097/files/magic_chef_furnace.pdf
    • https://cdn.shopify.com/s/files/1/0435/8645/3663/files/javemizusanusuvajebu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7968/7587/files/nelson_math_grade_7_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0435/5971/4971/files/1711984184.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc88041e87994e6a842661a0e0129771.pdf
    • https://static.usrfiles.com/ugd/b8c837_c07a62cfc9d34878b09ee2c189b8d570.pdf
    • https://static.usrfiles.com/ugd/7f46b5_7645efe85a3943d2983e1ef283b68077.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046bf.bin
86edcac942539f7f2c3d8ed5890f0b87fec57eaeda5ac3292dd9cad583ab41ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46BF 4824 bytes
font_01_sfnt_off0000572e.bin
a241b784655bd715ac2e6737ffaecefce9c2188a14b973fd8af5c685f607dfee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x572E 9992 bytes
font_02_sfnt_off00007943.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7943 4324 bytes

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