Malicious PDF — malware analysis report

Static analysis result for SHA-256 7303597d4f3adf91…

MALICIOUS

PDF

44.9 KB Created: 2020-10-25 22:38:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afcbadb7fdcf57b7583885a714f32d0c SHA-1: 61c22e36f241f997ba1f0080aa0fa93c77b99a9b SHA-256: 7303597d4f3adf91a363c5877223d64e8e042e50a6ff67d1ee97724f5a5ab9e0
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to potentially malicious content. The primary redirector URL is https://ttraff.link/123?keyword=bus+simulator+indonesia+apk+mod+revdl, which is flagged as malicious. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is part of a phishing or scam campaign.

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/123?keyword=bus+simulator+indonesia+apk+mod+revdl
    • https://cdn-cms.f-static.net/uploads/4386091/normal_5f9257f272a0c.pdf
    • https://cdn-cms.f-static.net/uploads/4375207/normal_5f8ebb0e240b8.pdf
    • https://cdn-cms.f-static.net/uploads/4366620/normal_5f87db19088a4.pdf
    • https://cdn-cms.f-static.net/uploads/4388156/normal_5f8d657d69c7d.pdf
    • https://cdn-cms.f-static.net/uploads/4379482/normal_5f8b2ea678114.pdf
    • https://cdn-cms.f-static.net/uploads/4368955/normal_5f8f98cf6af2c.pdf
    • https://cdn-cms.f-static.net/uploads/4369311/normal_5f936b2238eab.pdf
    • https://cdn-cms.f-static.net/uploads/4388038/normal_5f8fc5f279c00.pdf
    • https://cdn-cms.f-static.net/uploads/4393785/normal_5f91b8628e21e.pdf
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5f884feb5c324.pdf
    • https://cdn-cms.f-static.net/uploads/4378425/normal_5f8b7074e8ccc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0503/8309/3910/files/matter_analogies_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/1883/8435/files/romeo_and_juliet_timeline_quizlet.pdf
    • https://uploads.strikinglycdn.com/files/cd9718cf-5408-4013-aeee-80013db64167/zoganunidegikevigotuxuxiv.pdf
    • https://uploads.strikinglycdn.com/files/f3f769ea-15fc-4861-a4fd-ad6160a9066b/zizupatipikovajexop.pdf
    • https://uploads.strikinglycdn.com/files/d83fe346-10e4-48aa-9d4c-d14292511182/1022242817.pdf
    • https://uploads.strikinglycdn.com/files/26017fcb-135f-46a3-b295-8b4b7df131c4/3175829021.pdf
    • https://uploads.strikinglycdn.com/files/0c4ec05e-a18e-4ca5-a679-30c271c1ef81/94201681323.pdf
    • https://uploads.strikinglycdn.com/files/8b9bf11c-e55b-4059-abe6-0891fbd3a143/murutuva.pdf
    • https://uploads.strikinglycdn.com/files/0b08ced0-c328-4fb5-bcf0-b60bb6ea08bd/67403490647.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063ad.bin
f66f79ef333f5151ddb8bc18370e3684f44db4157bab6ee3fffafa9e8b3dcf6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x63AD 5160 bytes
font_01_sfnt_off0000751b.bin
2b7c3ab53d06067a0f36a7124f0e2bf93c367ade2d88102931b34c369c68ab5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x751B 10204 bytes
font_02_sfnt_off0000981d.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x981D 4324 bytes