Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b2ccdb16c59e46…

MALICIOUS

PDF

75.9 KB Created: 2020-08-09 08:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fadf4b638dff82e7bf3654d124cb1ba4 SHA-1: 6396e9123dd32bbdf43b6371b8bfeb16abb94ff5 SHA-256: 85b2ccdb16c59e46cd757c661071329c5ce3de43ccc55233b802dcb0bd2965e1
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious due to its inclusion of a redirector link pointing to known malicious infrastructure. It also contains a large number of external PDF links, suggesting an attempt at SEO poisoning or a link farm for malicious redirection. The embedded URL in the document body, 'https://ttraff.ru/pify?keyword=the+dead+boyfriend+rl+stine+pdf', is a primary indicator of this malicious activity.

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=the+dead+boyfriend+rl+stine+pdf
    • http://files.saintsmmk.com/uploads/1/3/0/7/130775080/gemakuf.pdf
    • http://teginek.curtfonger.com/uploads/1/3/0/7/130739615/5734659.pdf
    • http://files.zombietoes.com/uploads/1/3/2/6/132695432/wopixox.pdf
    • http://files.djsfunctionandevents.com/uploads/1/3/1/4/131483305/3ce81c86fb1a2.pdf
    • http://files.narwc.org/uploads/1/3/0/9/130969118/2af283bc70.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/49523566025.pdf
    • https://cdn.shopify.com/s/files/1/0448/0273/6279/files/core_and_advanced_java_black_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/7678/6078/files/wozuvisuwifemir.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6217/files/tuzekorewe.pdf
    • https://cdn.shopify.com/s/files/1/0429/6943/2230/files/zupunuzetolazatelap.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/texirid.pdf
    • https://cdn.shopify.com/s/files/1/0436/0480/3746/files/envision_math_grade_2_topic_1.pdf
    • https://cdn.shopify.com/s/files/1/0431/5122/9089/files/50336093805.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/foxiwekukixidugebebulopi.pdf
    • https://cdn.shopify.com/s/files/1/0436/0388/6238/files/timipisema.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/7185369789.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/13161452576.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_off0000ecf4.bin
3b40e76b0f230321f3047e0d273defe285d7de6e4f5e67db0033ff056e774ac6
pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 5320 bytes
font_01_sfnt_off0000ff06.bin
ccfba64adca6114bb7a52663595e516ed90241f44c714efba167bda1a3c26eab
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF06 10320 bytes