Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d58871b6726d99f…

MALICIOUS

PDF

52.0 KB Created: 2020-11-01 09:02:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb6d326d446c8a55fd479eba2a806586 SHA-1: 7c755ba44a45eb5af8f8b3a32a4eafceb39489c9 SHA-256: 8d58871b6726d99f3f1e8f5f0d487a5a87082c1cb385c0dc04bedec0dd3c8ac2
154 Risk Score

Malware Insights

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

The PDF contains embedded links and text that mimic a 'Carrier air conditioner parts manual', but the primary link redirects to a known malicious domain. The ML classifier strongly indicated maliciousness, and the PDF was flagged for linking to malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, likely for phishing or malware delivery.

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://gettraff.ru/aws?keyword=carrier+air+conditioner+parts+manual
    • https://cdn-cms.f-static.net/uploads/4386080/normal_5f91dd37c60e2.pdf
    • https://nogomikosisodop.weebly.com/uploads/1/3/2/6/132681488/588c0cb8c.pdf
    • https://jaketomerinojox.weebly.com/uploads/1/3/4/1/134109184/8911111.pdf
    • https://cdn-cms.f-static.net/uploads/4379483/normal_5f8b02ed06fb2.pdf
    • https://cdn-cms.f-static.net/uploads/4379718/normal_5f8edf004a0b7.pdf
    • https://korumarivaz.weebly.com/uploads/1/3/4/5/134506991/5128120.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/98082580-f084-4f21-bb85-cc539a8f5d63/dr_seuss_character_name_generator.pdf
    • https://uploads.strikinglycdn.com/files/30bb3640-76ee-4c8a-96d4-40eb4f452dd7/plano_cartesiano_figuras_de_animales.pdf
    • https://uploads.strikinglycdn.com/files/8304d7a3-06b0-4adc-bf8d-d862ed5e456b/80303808933.pdf
    • https://cdn.shopify.com/s/files/1/0485/9920/4000/files/tennant_7400_floor_scrubber_parts_manual.pdf
    • https://cdn.shopify.com/s/files/1/0504/8906/5664/files/bukonogutaletanikanowufi.pdf
    • https://uploads.strikinglycdn.com/files/fcf3d565-8436-4dfd-937d-413ae283cdea/75489564343.pdf
    • https://uploads.strikinglycdn.com/files/8ecc9457-c28e-4101-a1c5-551809486ba4/gt_100_manual.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_off00008d9a.bin
75f6722dac55130d7c292d0c443f8f1ac8dd0ed4846a54decb559dcc05387dbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D9A 5124 bytes
font_01_sfnt_off00009eeb.bin
622d167250741ed66e075b369fa5d37bdf95a1342a7c13465edab68ead933aba
pdf-font-stream PDF embedded font (sfnt) at offset 0x9EEB 10520 bytes