Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97f816ad6eff596…

MALICIOUS

PDF

43.3 KB Created: 2020-11-04 11:03:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 791807c35743a2b50152b401c5804a3f SHA-1: 5039445fdeb868c491152fb5e9f05ad02b7992f1 SHA-256: a97f816ad6eff596ed4c40bd5877af85668798016145a46498e3f0e60b3f7dc9
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links pointing to external PDF files, a technique often used for SEO manipulation or to host malicious content. One of the primary links directs to a known malicious redirector, indicating a high likelihood of malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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.club/123?keyword=words+with+grat
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/68ad2ba6.pdf
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5f90af34e986e.pdf
    • https://cdn-cms.f-static.net/uploads/4370054/normal_5f96d1fcd5e51.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/cbaaf060-b5b5-47ac-8cf4-5b7d58f2855d/lorazebekuwajigedadufip.pdf
    • https://uploads.strikinglycdn.com/files/320caa18-9054-4bf3-b11e-338451ad7430/bojujokoxejolar.pdf
    • https://uploads.strikinglycdn.com/files/d4ccd31e-6055-4b85-b4ae-1a4547d0fa92/37549686697.pdf
    • https://uploads.strikinglycdn.com/files/abcc2133-23b0-4852-a311-d5e97ec8261e/swtor_carnage_marauder_5.6_rotation.pdf
    • https://uploads.strikinglycdn.com/files/1e16b309-d8a4-42be-8431-866952959a7f/13586791858.pdf
    • https://uploads.strikinglycdn.com/files/45e545b1-bde0-4ae5-a25d-9ed70d9eb04c/gapopivuwefumodivo.pdf
    • https://uploads.strikinglycdn.com/files/6731073c-b422-4905-a38b-47bbaaccc196/xekolafasegovutozare.pdf
    • https://uploads.strikinglycdn.com/files/8dcc8586-eeb9-420a-bc70-f58cf32c5f1b/scotts_riding_mower_bagger_parts.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_off00005dc0.bin
c86ea3f2088e4b1b7c73ecf7e5246d867e81aadcbd9c709286605f4bc401d6fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC0 4724 bytes
font_01_sfnt_off00006df3.bin
091bb1b4626a6c3cbe3b5512cc80f568bfff7eda9c85a881138c2cfc237b618f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF3 10696 bytes
font_02_sfnt_off0000928f.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x928F 4324 bytes