Malicious PDF — malware analysis report

Static analysis result for SHA-256 983645215faaf4fa…

MALICIOUS

PDF

39.5 KB Created: 2020-08-30 06:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1eca6462765a6e1c0eeb61f647acfc0 SHA-1: f3f753e1b4a98c636f248cd7565eefbe28d49cbd SHA-256: 983645215faaf4fa09268f40bc2bdc25aeadfcbe8b1b3a0223c57ac6d9901d65
152 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be a link farm designed to lure users to potentially harmful external sites.

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.cc/wix?keyword=champs+lexical+de+la+mort
    • https://static.usrfiles.com/ugd/b8c837_941a267a2d6b460f93fc17b5f551428b.pdf
    • https://static.usrfiles.com/ugd/b8c837_adca05bc47114b2da67169625e1603c1.pdf
    • https://static.usrfiles.com/ugd/05900a_47279cf5619a435a94546e4cc9fa35d7.pdf
    • https://static.usrfiles.com/ugd/33a16d_1ec682a5d53f4d0f8bba488e228e0240.pdf
    • https://cdn.shopify.com/s/files/1/0436/2177/7570/files/35732380484.pdf
    • https://cdn.shopify.com/s/files/1/0434/7294/5304/files/elementary_mathematical_modeling.pdf
    • https://cdn.shopify.com/s/files/1/0437/8063/6821/files/74727886137.pdf
    • https://cdn.shopify.com/s/files/1/0437/1434/7160/files/shakespearean_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0429/2512/9891/files/kenonikozipufiturusinifuz.pdf
    • https://static.usrfiles.com/ugd/b8c837_a322527bd40c4432be99b75aae917238.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d1fdfa2a8434fa1ab4f4d283511b5a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_b128c3a141f74a0eb75a7d75772ce05b.pdf
    • https://static.usrfiles.com/ugd/79e5df_a12982ccf0cb4508a8ae4876ae2e81b5.pdf
    • https://cdn.shopify.com/s/files/1/0434/7691/0242/files/letters_from_an_astrophysicist_neil_degrasse_tyson.pdf
    • https://cdn.shopify.com/s/files/1/0437/0199/3622/files/rejenivisi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8361/9736/files/brian_pumper_movies.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_off00005ce5.bin
20746bdacb6dc41e090964aa7a552db341ef6c57b61462c21b67cedcea72d729
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE5 5284 bytes
font_01_sfnt_off00006eb7.bin
da6b9d867fa78f2e6aa4427054123f7629b80a96473e3e4f01b0553252419f12
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB7 10076 bytes