Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83554807276dff3…

MALICIOUS

PDF

53.1 KB Created: 2020-08-30 03:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b09eb61a41ecb81789bfdd4754b8542 SHA-1: 0e7d87349670717d359404932ac19ac74ac64b00 SHA-256: a83554807276dff34961951dae08bfcfd9b8279d40a79c518439bde661683770
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious due to the presence of numerous embedded links. One critical heuristic firing indicates a PDF link to known malicious redirector infrastructure, specifically 'https://ttraff.ru/wix?keyword=kkfit+bulking+program+pdf+free'. Another critical heuristic indicates a PDF SEO link farm, with a large number of external PDF links, the first of which is 'https://static.usrfiles.com/ugd/8de238_7c6aa3112f52458fb9bea2e901269390.pdf'. The document body contains garbled text but includes the same malicious URL and a benign-looking PDF filename, suggesting a lure or redirection attempt.

Heuristics 3

  • 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.
  • 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=kkfit+bulking+program+pdf+free
    • https://static.usrfiles.com/ugd/8de238_7c6aa3112f52458fb9bea2e901269390.pdf
    • https://static.usrfiles.com/ugd/b56239_a9328ee8d4f64fd985b0737a991f0255.pdf
    • https://static.usrfiles.com/ugd/10e3af_e9059f5789674d44b2597f0758bf5440.pdf
    • https://static.usrfiles.com/ugd/5926b4_b1bcd1415bf6462b98abb59768b30564.pdf
    • https://cdn.shopify.com/s/files/1/0439/3612/0990/files/fonctionnement_de_l_appareil_gnital_fminin.pdf
    • https://cdn.shopify.com/s/files/1/0437/9358/0189/files/zezolasunezoxeso.pdf
    • https://cdn.shopify.com/s/files/1/0430/6042/8962/files/segaze.pdf
    • https://cdn.shopify.com/s/files/1/0433/3928/4645/files/equivalent_expressions_6th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0431/1747/8044/files/biblia_de_estudio_diario_vivir_reina_valera_1960_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0435/3150/1720/files/formt_bakalsk_prce_muni.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0019/files/bodybuilding_workout_plan_and_diet.pdf
    • https://cdn.shopify.com/s/files/1/0430/5013/9801/files/sozozowujatizumofuxawi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1571/files/understanding_and_using_english_grammar_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9146/files/gewodafamozeweduwa.pdf
    • https://cdn.shopify.com/s/files/1/0432/5100/7638/files/52281971784.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_off00009171.bin
5228c2b6d23321645783aace99f8d4eff7880bc3a40303c376d98879af8bd13b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9171 5356 bytes
font_01_sfnt_off0000a382.bin
4e92d9226c228288a080301e07caf081f9fb8ca9671d54621b3eb8f6315c3c3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xA382 10884 bytes