Malicious PDF — malware analysis report

Static analysis result for SHA-256 313ff3def50ed6c6…

MALICIOUS

PDF

69.9 KB Created: 2020-08-05 04:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9cb473f0fc5f457af8a851c65611bc9 SHA-1: 3904d593a292d64ab143e20e682114d1da266874 SHA-256: 313ff3def50ed6c61455f0c11c254b45a594e7049a8353f43a14267cc08d19df
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=cesare+pavese+cuentos+pdf'. This URL is likely used to redirect users to malicious content. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The file is generated by wkhtmltopdf, a tool often abused for creating malicious documents.

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=cesare+pavese+cuentos+pdf
    • http://files.jacquelinesdancestudio.com/uploads/1/3/1/3/131397950/gagibalu_tifosajerafu.pdf
    • http://files.vontrappflowers.shop/uploads/1/3/0/9/130969434/799077.pdf
    • http://files.ncontrack.org/uploads/1/3/0/7/130775462/wexuv_pizub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99231100330.pdf
    • https://cdn.shopify.com/s/files/1/0432/5569/3470/files/98237016687.pdf
    • https://cdn.shopify.com/s/files/1/0428/3075/8054/files/putting_on_sunglasses_emoticon.pdf
    • https://cdn.shopify.com/s/files/1/0428/7702/6463/files/bukepovelikazugigugolejoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/3671/2861/files/98179920471.pdf
    • https://cdn.shopify.com/s/files/1/0437/7464/0286/files/83104611022.pdf
    • https://cdn.shopify.com/s/files/1/0432/8646/2620/files/56349999413.pdf
    • https://cdn.shopify.com/s/files/1/0431/2468/7014/files/add_font_to_illustrator.pdf
    • https://cdn.shopify.com/s/files/1/0430/6914/5241/files/8793337200.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1149/files/59988727655.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/sejiwivosex.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1278/files/97793442874.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62222626122.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_off0000d254.bin
9e2f4b08b54a8ce5c41f1c299ae40145c02204966050eef0de3e56209cc16a75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD254 5080 bytes
font_01_sfnt_off0000e3ad.bin
fbe78d9eff6f06039df1c24cf243714db3ecbaff77031d9e19ca83d6b3f228b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AD 11460 bytes

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