Malicious PDF — malware analysis report

Static analysis result for SHA-256 905bf30c35ca33c9…

MALICIOUS

PDF

80.4 KB Created: 2020-08-21 02:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac60c7d38f6e1dee03e39ada52a20c80 SHA-1: 87061eb3da6c63ac19580094d5301cc5164c6de6 SHA-256: 905bf30c35ca33c96c8e014c630891d2a400047143d16b3a6c0c70f5c9565f04
150 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 'https://ttraff.ru/pify?keyword=delhi+metro+map++pdf+file'. This URL is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, contains the same URL, reinforcing its role in the attack. 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=delhi+metro+map++pdf+file
    • http://files.uccstj.com/uploads/1/3/1/4/131437402/jefal.pdf
    • https://cdn.shopify.com/s/files/1/0437/4583/7208/files/15534692688.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/63358921853.pdf
    • https://cdn.shopify.com/s/files/1/0432/7030/7995/files/gimuboviranotunux.pdf
    • https://cdn.shopify.com/s/files/1/0438/7025/7320/files/xowapukitaxi.pdf
    • https://cdn.shopify.com/s/files/1/0455/6704/9893/files/duplicate_sheet_trong_excel.pdf
    • https://cdn.shopify.com/s/files/1/0434/3336/1574/files/3d_java_game_dedomil.pdf
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/11048964789.pdf
    • https://cdn.shopify.com/s/files/1/0431/9684/2142/files/41847152252.pdf
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/79979683167.pdf
    • https://cdn.shopify.com/s/files/1/0436/1850/0765/files/exercices_corriges_d_atomistique.pdf
    • https://cdn.shopify.com/s/files/1/0431/1960/7962/files/54384903948.pdf
    • https://cdn.shopify.com/s/files/1/0438/0993/1426/files/17383916423.pdf
    • https://cdn.shopify.com/s/files/1/0434/0508/2780/files/former_ceo_en_francais.pdf
    • https://cdn.shopify.com/s/files/1/0431/4890/2560/files/28334357854.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
stream_006_off00010193.bin
16996e03c421de4e5d12888730f435f4c1c9f0659d5e3199c8370e1ead3b63b8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10193 17184 bytes
font_00_sfnt_off0000bec4.bin
c6f0684b612548dc6e99ae08ec46a1a0ca3dc68fdfd56efe12d9f62f4f7e6930		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC4 5104 bytes
font_01_sfnt_off0000cff5.bin
bb1906442c0f9c2eeece45ba6614642bbb846ff65cc1105eceee38b1a983c23f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF5 16032 bytes

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