Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4ca2bc12eea82b…

MALICIOUS

PDF

50.5 KB Created: 2020-08-30 08:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d98a3304998adc2dbd8f6125c7ff00d7 SHA-1: 2b4552ee00ce369e2681eb82915f94a9c8bac20a SHA-256: 7d4ca2bc12eea82ba8684bfb10a6554686c9b5dfbfe03e7767d63ca8ba66f04e
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating a link to known malicious redirector infrastructure. The embedded URL 'https://ttraff.club/wix?keyword=game+theory+an+introduction+steve+ta' is the primary indicator of malicious intent. The file also exhibits characteristics of a link farm, with numerous external PDF links, suggesting a broader distribution or SEO manipulation tactic. The ML classifier strongly supports the malicious verdict.

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.club/wix?keyword=game+theory+an+introduction+steve+ta
    • https://static.usrfiles.com/ugd/b8c837_e0c0ceca269946ed84108e499f627310.pdf
    • https://static.usrfiles.com/ugd/87fdc7_69ca148e211549639962c8df1e3a1c47.pdf
    • https://static.usrfiles.com/ugd/544c7e_eba289e1d34c45f69b22515a4cab9a2d.pdf
    • https://cdn.shopify.com/s/files/1/0463/6249/3083/files/armed_heist_pc.pdf
    • https://cdn.shopify.com/s/files/1/0432/7286/3907/files/nirator.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zejakepujubuk.pdf
    • https://cdn.shopify.com/s/files/1/0449/9360/9896/files/37593948738.pdf
    • https://cdn.shopify.com/s/files/1/0434/3074/0135/files/snapper_self_propelled_mower.pdf
    • https://cdn.shopify.com/s/files/1/0460/6836/7524/files/5011035043.pdf
    • https://cdn.shopify.com/s/files/1/0434/5672/5153/files/wexepuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/0773/8019/files/politische_philosophie.pdf
    • https://cdn.shopify.com/s/files/1/0438/6209/8085/files/employee_of_the_month_2004.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1031/files/differential_calculus_limits_and_continuity.pdf
    • https://cdn.shopify.com/s/files/1/0431/1174/3639/files/line_break_markdown.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_off000088d2.bin
114cb6130012fedf3b8dc87a10ddd93c6900cbadefbad7f9b437bff3e121587d
pdf-font-stream PDF embedded font (sfnt) at offset 0x88D2 5340 bytes
font_01_sfnt_off00009ae2.bin
d565ea368fd27a0e576ffcc6b5ca071851144ff8ffeb8c35df1b202d2e4d4e73
pdf-font-stream PDF embedded font (sfnt) at offset 0x9AE2 9852 bytes