Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7f51456fa23ee0…

MALICIOUS

PDF

40.2 KB Created: 2020-08-11 23:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d892c22b09b995d3a2ac249b90b052a8 SHA-1: e16e806cd6926e9a660fc6d0371cfaa7d8edf88a SHA-256: de7f51456fa23ee091e6b3f40997581dbfa960ba213f14fedf626c0ca9b2873a
152 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, specifically pointing to 'https://ttraff.ru/pify?keyword=wings+of+fire+book+9+pdf+free'. This indicates the document is designed to redirect users to potentially harmful content. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to improve search engine ranking for malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=wings+of+fire+book+9+pdf+free
    • http://files.millermicrofarm.com/uploads/1/3/1/4/131453615/2359108.pdf
    • http://files.insubordinatebooks.com/uploads/1/3/1/4/131453526/261052.pdf
    • http://files.reassure.us/uploads/1/3/1/4/131408344/retixa_bawug_mexavojik_razipepokira.pdf
    • http://files.cybersecurityinc.net/uploads/1/3/2/6/132681938/natuwafegaga.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5510/files/75816809757.pdf
    • https://cdn.shopify.com/s/files/1/0431/0623/8613/files/pidof.pdf
    • https://cdn.shopify.com/s/files/1/0429/9220/5978/files/98277786615.pdf
    • https://cdn.shopify.com/s/files/1/0437/1267/5990/files/52339768650.pdf
    • https://cdn.shopify.com/s/files/1/0434/2392/4376/files/zoology_textbook_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0429/9449/9743/files/46326454196.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57355052908.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mufowotipopugisafe.pdf
    • https://cdn.shopify.com/s/files/1/0439/8769/7822/files/91313786928.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6645/files/favaduwulofela.pdf
    • https://cdn.shopify.com/s/files/1/0434/0236/3045/files/69913539288.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/
    • https://cdn.shopify.com/s/files/1/0439/8769/7822/files/91313

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c58.bin
a2d9fffd4cd620ab123324938bdebb9cb3facc059fc6553dc9f384d36de62f74
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C58 5340 bytes
font_01_sfnt_off00006e9a.bin
a878aa8e27fd8ccccffdfe7f13fd6eaf41cd4730059fbdde7a0f72017ca9f627
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9A 10372 bytes