Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a4848fabf3691b…

MALICIOUS

PDF

34.9 KB Created: 2020-09-08 22:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2cdfb9a499ac348b1ebffeb8d6b94b8 SHA-1: 8503da5f2d1e147d4293a5019111c1059af0213e SHA-256: d8a4848fabf3691b4098dab74dbc30b587278cd9dfc461c55ece19d100375631
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'jingle bells minor key sheet music' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous Shopify links indicates a link farm used for SEO poisoning or to obscure the true destination.

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.link/pify?keyword=jingle+bells+minor+key+sheet+music
    • https://cdn.shopify.com/s/files/1/0461/6755/6259/files/sarasota_hardware_stores.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69298849274.pdf
    • https://cdn.shopify.com/s/files/1/0432/6827/6384/files/530012809.pdf
    • https://cdn.shopify.com/s/files/1/0430/0659/1127/files/31310396462.pdf
    • https://cdn.shopify.com/s/files/1/0438/6629/2389/files/45317255872.pdf
    • https://cdn.shopify.com/s/files/1/0438/7173/1880/files/1031675934.pdf
    • https://cdn.shopify.com/s/files/1/0431/4238/1725/files/visazotekuginanizu.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b6e3b6021034155861f02ebd27a7b7e.pdf
    • https://static.usrfiles.com/ugd/cece23_ba03964ee2cd40c5bf349c430244ec98.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_c53943ea88e8445bbaf74c986e08ab05.pdf
    • https://static.usrfiles.com/ugd/97634b_22bf2d1e60524228bcb8d67c6dfef548.pdf
    • https://static.usrfiles.com/ugd/485053_fd8dca2f76ca4af6988a0232adf8f222.pdf
    • https://static.usrfiles.com/ugd/b8c837_c0f0038b036a46fb83fd4948d088a571.pdf
    • https://static.usrfiles.com/ugd/2ca22b_87c0e600173f437a9d4496f84b8cef67.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_off00004bd6.bin
dd5d7db74da9c2df0731093e028ca1ad44f823e6c56ac5b8e449abb6dd05e5aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x4BD6 5300 bytes
font_01_sfnt_off00005dbe.bin
dc2dde50fb364aa661b4d2d5475a3ed6706290f79ae1d85b6bdcfbdac0e5cc51
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DBE 9732 bytes