Malicious PDF — malware analysis report

Static analysis result for SHA-256 3379bafb335f2357…

MALICIOUS

PDF

45.3 KB Created: 2020-08-04 22:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f14c7d9022fc98a541b19f1d980b212 SHA-1: 60b0c1750e5e4e4df9cb4ac10669eb9ca3a3bf01 SHA-256: 3379bafb335f23572379264350cfb699efd68184529b00cf9dfaa076231313da
152 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains a significant number of embedded links. One of these links, 'https://ttraff.com/pify?keyword=cat+2020+paper+pdf+hitbullseye', points to a known malicious redirector. The document also exhibits characteristics of a link farm, with numerous external PDF links, suggesting a potential SEO manipulation or redirection scheme. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector and the link farm strongly indicate a malicious intent.

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.com/pify?keyword=cat+2020+paper+pdf+hitbullseye
    • http://jezisatuz.lifepathchurch.org/uploads/1/3/0/7/130775934/6747582.pdf
    • http://files.heritageschoolofdiscovery.com/uploads/1/3/2/8/132815388/4a249.pdf
    • http://files.sharonebrooks.com/uploads/1/3/1/1/131164153/vuxexodegobobaven.pdf
    • http://files.craniosacralnashville.com/uploads/1/3/0/9/130969334/wegigiv_gotuz_pemulisopura.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dojezurin.pdf
    • https://cdn.shopify.com/s/files/1/0431/2029/6090/files/png_magic_number.pdf
    • https://cdn.shopify.com/s/files/1/0429/5308/0991/files/wuvigewidifafogige.pdf
    • https://cdn.shopify.com/s/files/1/0432/7197/9172/files/92362567899.pdf
    • https://cdn.shopify.com/s/files/1/0427/8065/5775/files/81276249094.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0030/files/6920067011.pdf
    • https://cdn.shopify.com/s/files/1/0432/8977/2187/files/calvary_chapel_distinctives.pdf
    • https://cdn.shopify.com/s/files/1/0438/2159/6834/files/41045604214.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78992801071.pdf
    • https://cdn.shopify.com/s/files/1/0433/6877/5841/files/nimivadop.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_off00006b84.bin
1b697db8d4dca47362c58142c5800e2b8f10087dbd66a74a80636b43c6cc5bf8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B84 5548 bytes
font_01_sfnt_off00007e5a.bin
3f2b409cbab64783525c6d662821b879b07c136cb0c9035a503c3b86446e3f01
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E5A 13572 bytes