Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7d4e7a1cbc1d32…

MALICIOUS

PDF

46.1 KB Created: 2020-07-17 03:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7d53b3dc8f2e923430d180868348c32 SHA-1: 159aa641cea5095089d6706d34436a29cb4df010 SHA-256: 8f7d4e7a1cbc1d32d7a6d8e1731a808f9c0b85c6b9c7a12efc26ded466c896ff
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The primary malicious URL identified is ttraff.ru, which is known for redirecting to malicious content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, which aligns with the SEO link farm finding.

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/wb?keyword=iso%20specification%20for%20inserts%20and%20tool%20holders%20pdf
    • http://files.elitestreetwear.com.au/uploads/1/3/1/4/131455680/5d5ddcb.pdf
    • http://files.isunsslha.com/uploads/1/3/1/8/131858540/123c177.pdf
    • http://files.chalkskin.com/uploads/1/3/0/7/130738512/5617332.pdf
    • http://files.bylnj.com/uploads/1/3/0/7/130776403/f81acff.pdf
    • http://files.pronghornguideservice.net/uploads/1/3/1/1/131164567/zuxiwevobogufiv-pujetujodo.pdf
    • http://files.pronghornguideservice.net/uploads/1/3/1/1/131164567/
    • https://cdn.shopify.com/s/files/1/0434/9827/4978/files/87945915232.pdf
    • https://cdn.shopify.com/s/files/1/0430/6596/6754/files/10275374169.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/33374625424.pdf
    • https://dikoxitixi.files.wordpress.com/2020/07/wugufitufazutekoxofetewis.pdf
    • https://nanesufated.files.wordpress.com/2020/06/861001556.pdf
    • https://lotuwekozu716611446.files.wordpress.com/2020/07/37030251218.pdf
    • https://nutumomox.files.wordpress.com/2020/07/59520731431.pdf
    • https://fuxarekalo.files.wordpress.com/2020/07/vilejibiganewadisiforet.pdf
    • https://cdn.shopify.com/s/files/1/0433/4993/4229/files/robifofelegivojiguresi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6649/0006/files/jilekimubojadidewugepef.pdf
    • https://cdn.shopify.com/s/files/1/0430/3156/0354/files/lobiwomipazuxegogar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51031200676.pdf
    • https://cdn.shopify.com/s/files/1/0429/7841/0655/files/fidaxepulez.pdf
    • https://cdn.shopify.com/s/files/1/0437/1116/8664/files/xasipusabelete.pdf
    • https://cdn.shopify.com/s/files/1/0430/8064/6807/files/94560353193.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_off00007624.bin
fe2263d74a55aff01e5b512673a3fd2364f69b40085569316d735df659386303
pdf-font-stream PDF embedded font (sfnt) at offset 0x7624 4968 bytes
font_01_sfnt_off000086f4.bin
1bab434d082fade58bdc8e42b39c8ad2dcecb0fb1780f121f49248688ebf3004
pdf-font-stream PDF embedded font (sfnt) at offset 0x86F4 10420 bytes