Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b5f974a003d081…

MALICIOUS

PDF

44.1 KB Created: 2020-08-08 10:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ce0606d7f38faff2ede07ad54bab483 SHA-1: 0312e55bcf255b616ce04c6149759c266877dca5 SHA-256: c5b5f974a003d081c66019f1a984f639cc43ba3007446cfde385a6cf544a233f
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One prominent link, 'https://ttraff.ru/pify?keyword=adobe+acrobat+pdf+reader+free+download+for+windows+10', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to downloading Adobe Acrobat Reader, reinforcing the lure. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/pify?keyword=adobe+acrobat+pdf+reader+free+download+for+windows+10
    • http://fabugera.exoticfeeders.com/uploads/1/3/1/0/131071157/pevigadoxakov.pdf
    • http://files.kemsgymanddance.com/uploads/1/3/0/7/130739693/c493b37201aede.pdf
    • http://files.thebaptistchurchoffranklin.com/uploads/1/3/0/7/130775076/7032302.pdf
    • http://files.holysmokescountrybbqandcatering.com/uploads/1/3/2/7/132740343/9696054.pdf
    • http://files.mansbestpetsitting.com/uploads/1/3/2/3/132302993/1457897.pdf
    • https://cdn.shopify.com/s/files/1/0434/1248/8343/files/rujiwepazapupibiboduz.pdf
    • https://cdn.shopify.com/s/files/1/0432/3855/5805/files/3874062293.pdf
    • https://cdn.shopify.com/s/files/1/0438/4381/3538/files/nevuvedejejosa.pdf
    • https://cdn.shopify.com/s/files/1/0440/8583/7989/files/convertir_un_escaneado_a_un_word_editable_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/wetuzubunowiwubuza.pdf
    • https://cdn.shopify.com/s/files/1/0436/0221/5074/files/20023144370.pdf
    • https://cdn.shopify.com/s/files/1/0428/6483/6764/files/4973459542.pdf
    • https://cdn.shopify.com/s/files/1/0437/2329/2840/files/tuxidoxabajasejefuvonegej.pdf
    • https://cdn.shopify.com/s/files/1/0437/3096/0536/files/goririjolugasaxanuviret.pdf
    • https://cdn.shopify.com/s/files/1/0431/5417/8216/files/mathematical_statistics_and_data_analysis_solutions_manual.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_off00006b13.bin
a5282dd658387e0132e6d22978391e1a849e5b4ed70361609704b8a3b7667d22
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B13 5564 bytes
font_01_sfnt_off00007e25.bin
d340382174d4557377987c3fc8f1df11fcd3993bc31f4439d2b6102f1a4fc804
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E25 11416 bytes