Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab57a4916d1fb1e…

MALICIOUS

PDF

39.0 KB Created: 2020-08-14 03:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e16737f1d66dcbbc563a1fb0b403a233 SHA-1: d5fee381fabc530e4a621561100679ab52382baa SHA-256: cab57a4916d1fb1e78e88e952a8c00a2767ae0c3958dd8b265254b3c706137e7
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic indicates these links are part of a malicious redirector scheme, directing users to potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious. The document body itself is largely obfuscated but contains a URL that appears to be part of the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wb?keyword=alevines%20tilapia%20roja%20pdf
    • http://files.familylawyerminnesota.com/uploads/1/3/1/6/131607712/jubigi_vomikewupinoz.pdf
    • http://files.streetcorephotography.com/uploads/1/3/1/8/131856318/wobevovifa.pdf
    • http://wemeponij.ballmania.com/uploads/1/3/2/8/132814930/d7cef043.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/blockly_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/6009/1287/files/8756133993.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13908697451.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27621352833.pdf
    • https://cdn.shopify.com/s/files/1/0429/2263/9527/files/wutazugisibikiguseviga.pdf
    • https://cdn.shopify.com/s/files/1/0435/5974/7745/files/fagamoladugikodetaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5240/8742/files/81680013552.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32686583269.pdf
    • https://cdn.shopify.com/s/files/1/0430/8323/5489/files/dokafebevurawetuwazefojez.pdf
    • https://cdn.shopify.com/s/files/1/0448/6879/6578/files/cercospora_leaf_spot_of_chilli.pdf
    • https://cdn.shopify.com/s/files/1/0430/4997/5961/files/28255790728.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/luwurijaxit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/71135401618.pdf
    • https://cdn.shopify.com/s/files/1/0435/8042/4351/files/aamir_khan_biography.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
font_00_sfnt_off00004aad.bin
b5e9eab3c701fd53fd22a0f4cdf4a1a25643fe0b2e53c1a9430f1b5f64faf4ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AAD 4948 bytes
font_01_sfnt_off00005b91.bin
3272ea32bcfb7b188a756e60fd3b29cb0889f77c0e7e43c82189d243716e8bc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B91 10936 bytes
font_02_sfnt_off00007f8a.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F8A 4324 bytes

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