Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba4c184f191c911…

MALICIOUS

PDF

73.5 KB Created: 2020-11-02 13:48:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 654b8d8af4f4b22a3ddde8fd7a1a0379 SHA-1: 717d7305bdfeb6da11bcc4bca14db92e2d24cc3d SHA-256: dba4c184f191c911dff143fc030c98d74cfdbc538c9ee5e477493409c02c3586
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to a URL that appears to be a lure for online games. The document body also contains this URL, reinforcing the phishing attempt. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious infrastructure, likely for further exploitation or credential harvesting.

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.me/123?keyword=unblocked+online+games+66+at+school
    • https://cdn-cms.f-static.net/uploads/4391915/normal_5f9ff0c29b89c.pdf
    • https://cdn-cms.f-static.net/uploads/4385427/normal_5f9e014db32fc.pdf
    • https://cdn-cms.f-static.net/uploads/4380876/normal_5f9b29b6acd9c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0502/5067/8464/files/simanimexaruwuzebojetu.pdf
    • https://uploads.strikinglycdn.com/files/425ee4a8-56fe-47f2-983f-8586f616614c/51956491792.pdf
    • https://s3.amazonaws.com/fajixe/point_of_view_worksheet_1_answer_key_ereading.pdf
    • https://uploads.strikinglycdn.com/files/61a51beb-dbef-4f6b-97fe-b7ff3a813502/72320801315.pdf
    • https://cdn.shopify.com/s/files/1/0505/4218/2563/files/free_redeem_code_for_minecraft_mojang.pdf
    • https://s3.amazonaws.com/fekaduvopigab/69422751419.pdf
    • https://uploads.strikinglycdn.com/files/a4a2bfa1-965b-454c-bf5e-a83f48c4d74a/jafilopigasidulijevimima.pdf
    • https://s3.amazonaws.com/jumedemimo/kepuxuxasali.pdf
    • https://s3.amazonaws.com/gosete/34539699601.pdf
    • https://s3.amazonaws.com/wilugugo/51050944530.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df7b.bin
1518787326ccbbe452721fb4d8ae2923ece4062aedf7292a10cc375760092a7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7B 5604 bytes
font_01_sfnt_off0000f267.bin
93c8f318fd42c62c2c98c062b6b20393c416a567b0d8d450857112b73afaa4ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 11304 bytes