Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8f364b3033103e…

MALICIOUS

PDF

50.6 KB Created: 2020-08-21 11:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99b4f1b00a92945cf3908e6ace2e96c0 SHA-1: 2fe1aca3056b665c2091c25e576d15eb409a2cd9 SHA-256: 4a8f364b3033103eff674298437827c37ca875bfc047f2a3c9a29afcd203e7fc
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that the link `https://ttraff.ru/pify?keyword=elgar+nimrod+music+sheet` points to known malicious infrastructure. The 'PDF_SEO_LINK_FARM' heuristic further suggests that the document is designed to host a large number of external links, likely for SEO manipulation or to distribute malware. The ML classifier also strongly flagged this PDF as malicious.

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=elgar+nimrod+music+sheet
    • http://files.thehigginsreport.com/uploads/1/3/0/7/130775750/jeruzenabadimo_dubil.pdf
    • http://files.retortsmplyjohn.com/uploads/1/3/2/6/132696171/rosikib.pdf
    • http://files.citydogsrescuedc.org/uploads/1/3/1/4/131437977/bomuvawixuvosa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67572949107.pdf
    • https://cdn.shopify.com/s/files/1/0439/5817/3854/files/bizuwojemado.pdf
    • https://cdn.shopify.com/s/files/1/0433/9567/8359/files/88552639335.pdf
    • https://cdn.shopify.com/s/files/1/0437/2607/8101/files/pedakivefadan.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2305/files/20591727898.pdf
    • https://cdn.shopify.com/s/files/1/0428/5143/4659/files/10445320627.pdf
    • https://cdn.shopify.com/s/files/1/0432/4855/0050/files/19583268061.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22584543347.pdf
    • https://cdn.shopify.com/s/files/1/0431/2337/6277/files/97181040346.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/63993806766.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005659.bin
72e15b81d95b05b67241f865ab95bb45aad8d259ed2556493de79f1837a34edd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5659 5308 bytes
font_01_sfnt_off0000682e.bin
f93542dbf11e1b78b0e03947724839818dd350ad06a5f6d49fbf9462215d74ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x682E 2060 bytes
font_02_sfnt_off000071d5.bin
7cc30090a15f86ad9a53281c393e5ff047d1345c6893f2099b00aa0211ea66af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71D5 16740 bytes
font_03_sfnt_off0000a641.bin
46d9b83afd797048ab251ddfc9ca9a6db44f3280724c231f6a80a061bcc6fc12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA641 16120 bytes

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