Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ca911d3ad6a294…

MALICIOUS

PDF

69.6 KB Created: 2020-08-22 19:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2b4672e490fc3af4cbc18e95e380144 SHA-1: 977acacee26f840cbee3a6a0dd5136e1ff0feb94 SHA-256: f6ca911d3ad6a294526262f2a346ffbaf4c6795c7753b3633ce327a463262dc8
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The primary attack pattern appears to be a link farm or redirector, potentially used for SEO manipulation or to distribute further malicious content. No scripts were extracted, limiting the analysis to the PDF structure and embedded URLs.

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=buck+converter+input+current+waveform
    • http://files.rvturtleview.com/uploads/1/3/0/7/130776326/bumaj.pdf
    • http://files.gohosa.com/uploads/1/3/2/3/132303163/1771572.pdf
    • http://vipos.mindfit-performance.com/uploads/1/3/0/7/130776326/43f3ec1dcac4.pdf
    • https://cdn.shopify.com/s/files/1/0431/1003/9719/files/3699670809.pdf
    • https://cdn.shopify.com/s/files/1/0435/2278/5444/files/34555699851.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/pobiwineken.pdf
    • https://cdn.shopify.com/s/files/1/0440/0365/5830/files/free_easy_piano_sheet_music_popular_songs.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2328/files/jidifikonajutotozorapatop.pdf
    • https://cdn.shopify.com/s/files/1/0436/0149/4179/files/94040716969.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/42030444216.pdf
    • https://cdn.shopify.com/s/files/1/0431/4729/6924/files/27429107648.pdf
    • https://cdn.shopify.com/s/files/1/0427/6885/9303/files/39527829250.pdf
    • https://cdn.shopify.com/s/files/1/0433/4895/1194/files/1539117816.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/93594949255.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6343/files/bridal_march_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/duzibuwusupamodugibeboz.pdf
    • https://cdn.shopify.com/s/files/1/0433/7962/2040/files/cement_manufacturing_project.pdf
    • https://cdn.shopify.com/s/files/1/0434/1995/9463/files/el_avesta_espaol.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_off0000c4bd.bin
25f8600abee264ac37d94891d9b4b26b259972336c4f0c41c7bdd5667b47007d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BD 5216 bytes
font_01_sfnt_off0000d689.bin
d3daf9d5c58a1cb9b29035083ff1fb4a8a7094f7853b0bc4284c52065f9b938c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD689 16216 bytes