Malicious PDF — malware analysis report

Static analysis result for SHA-256 3896d7131271e014…

MALICIOUS

PDF

43.2 KB Created: 2020-08-31 20:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3086b8ca45d812d70f16eb6a99a29fc1 SHA-1: 9750d6a18d1310f0025d5f4e7a4a79b75df06391 SHA-256: 3896d7131271e01428dd28262835c8862c085b145c4365a20a29b46788aa8fdc
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=saucony+women%2527+s+guide+8+running+shoe'. This URL is likely used to lure users to a malicious site. The document also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which point to Shopify domains, but the primary redirector is the most concerning. The ML classifier strongly supports the malicious nature of this PDF.

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=saucony+women%2527+s+guide+8+running+shoe
    • https://static.usrfiles.com/ugd/784815_a973eac035104286ab5a5c09f428a132.pdf
    • https://static.usrfiles.com/ugd/eb4c03_3c1589abce0444cd88aa8c258fbc8693.pdf
    • https://static.usrfiles.com/ugd/8ab72e_045c37dfc3c04a7db89caa9a1439e6ba.pdf
    • https://cdn.shopify.com/s/files/1/0438/0770/3201/files/lol_runes_guide_adc.pdf
    • https://cdn.shopify.com/s/files/1/0429/4747/7667/files/jasper_report_spring_boot.pdf
    • https://cdn.shopify.com/s/files/1/0432/1250/5252/files/95304578605.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bobidaxida.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/50760838248.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/35412626179.pdf
    • https://cdn.shopify.com/s/files/1/0431/9186/1412/files/93947086568.pdf
    • https://cdn.shopify.com/s/files/1/0433/0808/9509/files/38434214002.pdf
    • https://cdn.shopify.com/s/files/1/0462/2090/2553/files/emi_calculator_for_samsung_mobile.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_off000059ae.bin
417658ba2ba1b25612010752029e4c88f6567d9b6ada8b9b040c4ca9c868d484
pdf-font-stream PDF embedded font (sfnt) at offset 0x59AE 5648 bytes
font_01_sfnt_off00006cb2.bin
9604d5c39682e2c7208fd0a36d5fb7a7b6d5efd27316e83a1b8308cfe7f10c37
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB2 11128 bytes
font_02_sfnt_off000091cc.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x91CC 4324 bytes