Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1f2a20221dd596…

MALICIOUS

PDF

46.5 KB Created: 2020-09-02 02:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2abfbca3633a8c8b1af15ac726570e87 SHA-1: e6d7a5103585872dcebc7941e102d16b615f3365 SHA-256: cf1f2a20221dd596707cda0854d99d5f7f2caabc25a197651abf01438846cbe2
154 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 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of numerous other PDF links, many pointing to Shopify and static.usrfiles.com, indicates a link farm strategy, likely for SEO poisoning or distributing further malicious content. No scripts were extracted, limiting the analysis of direct payload execution.

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=android+toolbar+item+text+color
    • https://cdn.shopify.com/s/files/1/0429/2807/9004/files/12864957597.pdf
    • https://cdn.shopify.com/s/files/1/0437/5108/0090/files/tarewigexuzofu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0200/1570/files/new_zealand_native_crossword_clue.pdf
    • https://static.usrfiles.com/ugd/36f25b_87f7faa9cf014a33a1aa2c124013f90b.pdf
    • https://static.usrfiles.com/ugd/b8c837_cebfd4218f284c44a4ef5ce093e729b0.pdf
    • https://static.usrfiles.com/ugd/e4ff69_9af51e6c315d44d9afb6299a5fd735f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6b032325d904897bf9cf1e87d7ac8a1.pdf
    • https://static.usrfiles.com/ugd/aef5b7_c8a35ff946544551a779d8afd564c326.pdf
    • https://static.usrfiles.com/ugd/ed64d2_cee400330d4d4d0cad9ade44e0bd5195.pdf
    • https://static.usrfiles.com/ugd/ab0441_f2eb387d4dd34d50a31d678f45dea04f.pdf
    • https://static.usrfiles.com/ugd/197ed4_894633612b384d488ee3bd97ac82c51a.pdf
    • https://static.usrfiles.com/ugd/b8c837_94a01b52f17f4b78a9bf5541aeddee66.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_6f232333cc1e434889b9b89683e00bfe.pdf
    • https://static.usrfiles.com/ugd/8c0e65_286be60f54a54ac99303453ca822d129.pdf
    • https://static.usrfiles.com/ugd/ca9b0a_a3a40b9ab7d2406b9716ca7329b55971.pdf
    • https://static.usrfiles.com/ugd/122077_5f68d8de9d044b149dfb616844de816f.pdf
    • https://static.usrfiles.com/ugd/d54300_9b749fa41833493387126f2da7132cf3.pdf
    • https://static.usrfiles.com/ugd/238140_c1a33a1212ed4a829c692005a814e561.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_off00006a57.bin
43e4a9dc9b72e434dfe55e9f36ab7076332ee8fbb5d490223a68b85e67bfb999		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A57 4892 bytes
font_01_sfnt_off00007ad4.bin
968196904a8dbbc0a8150b4afc352d119d9fb0b2f2b282d644ff965726238d1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD4 10420 bytes
font_02_sfnt_off00009e88.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E88 4324 bytes

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