Malicious PDF — malware analysis report

Static analysis result for SHA-256 624b9ef7248589ed…

MALICIOUS

PDF

47.5 KB Created: 2020-09-05 19:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0fb867e44d790400476a3f0b146ac09 SHA-1: 5b969eb3d034e3069bbf783c72559350f30bd427 SHA-256: 624b9ef7248589eddffa5b8eaf7652f718996b625bf3a6feb602fd6fc0e60637
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a specific redirector URL that is flagged as malicious. The document body, though heavily obfuscated, contains text related to a movie download lure and the malicious URL. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be tricking the user into clicking the malicious link, likely leading to further compromise.

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=baahubali+2+tamilrockers+hd+movie
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/bf07b1_24799cce8c69493283c3b33c5469df7b.pdf
    • https://static.usrfiles.com/ugd/debbe1_7dd8268b32ce42f19ef4c99e2de66aae.pdf
    • https://static.usrfiles.com/ugd/fd4c29_4d1cfe9659a6424286a6a68b35c8f712.pdf
    • https://static.usrfiles.com/ugd/564d2e_cf54620ad0a94abdb43cdf705f4c6f43.pdf
    • https://static.usrfiles.com/ugd/6f53d7_ab9d808867544f9592b8258494fecf7c.pdf
    • https://static.usrfiles.com/ugd/64d889_2ee38d68b7d54129897df1c599f90732.pdf
    • https://static.usrfiles.com/ugd/3d7af5_089d58d082b6468786653d202525158f.pdf
    • https://static.usrfiles.com/ugd/e32576_ee8e9112a7c646d287068ee68872360c.pdf
    • https://static.usrfiles.com/ugd/f2ef67_2f8558b634074b9aa9b85b7ab9d3dbef.pdf
    • https://cdn.shopify.com/s/files/1/0452/3671/5677/files/vawenunorepidunim.pdf
    • https://cdn.shopify.com/s/files/1/0434/6776/7972/files/family_and_friends_6_answer.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006255.bin
704bc3df7bd164794a5c57dd943df46c8147f4d5a84c6f6fc43a17f8b1a0a6f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6255 5624 bytes
font_01_sfnt_off0000754a.bin
457ef636ab32d5aaaa870d0dab00b1d1c7b48380990c342fcc4c2277a279873a
pdf-font-stream PDF embedded font (sfnt) at offset 0x754A 10804 bytes
font_02_sfnt_off00009a71.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A71 16164 bytes