Malicious PDF — malware analysis report

Static analysis result for SHA-256 954afb4f0810ecf9…

MALICIOUS

PDF

38.9 KB Created: 2020-08-04 22:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a86bb3195a93855bfb3e6113159609b7 SHA-1: 66676ef93013c8e2c56456f36bb6fd214f293e9a SHA-256: 954afb4f0810ecf964dbf55cf080591c4b240197cb4618c0cd13e2895eb1e9ed
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is 'https://ttraff.cc/pify?keyword=ecocardiografia+fetal+pdf'. The document body, though heavily obfuscated, contains references to PDF and wkhtmltopdf, suggesting a link farm or SEO spam tactic. The presence of many benign-looking Shopify links alongside the malicious ones is a common technique to mask malicious activity.

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.cc/pify?keyword=ecocardiografia+fetal+pdf
    • http://files.firstempcommission.org/uploads/1/3/1/4/131438567/ridubokor.pdf
    • http://files.ohmog.org/uploads/1/3/2/6/132681488/todire_vuwot_pelixululijolo_lufojasil.pdf
    • http://files.divorcecoachingandconsulting.com/uploads/1/3/0/8/130874518/bejam-soselovorifat-tekumubobup-powidonuvewadar.pdf
    • http://files.forwater.ca/uploads/1/3/1/8/131856034/7862045.pdf
    • http://files.cjsprofessionalcleaning.com/uploads/1/3/0/7/130776275/mimumasek.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/diphyllobothrium_latum_morfologia.pdf
    • https://cdn.shopify.com/s/files/1/0435/9333/4952/files/carrier_transicold_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/3001/files/salil_sawarim_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0437/5543/8234/files/70381243982.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/luraxadafuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94448736580.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fuwofomakilaxenifotet.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/gulusibuwemogugiso.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1770/files/41436660241.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/tajadigopuxox.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_off00005e17.bin
306dc75dd8f1b1dfa594447480b827bc86deee772d35c49d46749defaa43cb9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E17 5104 bytes
font_01_sfnt_off00006f89.bin
0f4752835977eab570245313e3502cc4998fed665f9f1ec1b3b50f621c7978e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F89 9300 bytes

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