Malicious PDF — malware analysis report

Static analysis result for SHA-256 2859d177740145c6…

MALICIOUS

PDF

58.4 KB Created: 2020-08-30 16:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5a4a6f7bef797a448ced0bd9692da8c SHA-1: 4c9df9bdc4cfe9bf03f26da0b368618043453f9a SHA-256: 2859d177740145c6f14d0442ac50277b964cec9f9ce8a216a4e21aa64574161d
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the URL 'https://ttraff.com/wix?keyword=modelo+de+comunicacion+shannon+y+weaver', which is likely used to direct users to a phishing or malware-hosting site. The document body, though heavily obfuscated, contains this URL and other PDF links.

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/wix?keyword=modelo+de+comunicacion+shannon+y+weaver
    • https://static.usrfiles.com/ugd/c1de29_6e27f578300a41ada68debf9a6a5139e.pdf
    • https://static.usrfiles.com/ugd/b8c837_70300b25231c4d90b4d255ab2c11a50b.pdf
    • https://static.usrfiles.com/ugd/b8c837_9977ce3c087b4c299ea0255220b1c1a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa31fdb34c2c4170a71b12bf901b44b6.pdf
    • https://static.usrfiles.com/ugd/0f5b72_2a062199006e4649a4ad2130692db63b.pdf
    • https://static.usrfiles.com/ugd/8ab72e_490007121bed48fe869d2b5f89d88340.pdf
    • https://cdn.shopify.com/s/files/1/0438/4797/5062/files/minecraft_music_boxes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mojarugalemidim.pdf
    • https://cdn.shopify.com/s/files/1/0437/0923/5353/files/femes.pdf
    • https://cdn.shopify.com/s/files/1/0429/2745/6419/files/squash_commits_github.pdf
    • https://cdn.shopify.com/s/files/1/0447/2622/3001/files/algebra_math_formulas.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_off00008b04.bin
e28dad5cf1fccd987cec3122b7da198f7138818f00f759f0c13d3ee55da2e1c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B04 5436 bytes
font_01_sfnt_off00009d6f.bin
b0d471c79296f2ae5aa49ad5c34eb3c1de29250d18e78cb9ba34a4e89736a174
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D6F 13604 bytes
font_02_sfnt_off0000c82d.bin
35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC82D 16036 bytes