Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1c4efba0351642…

MALICIOUS

PDF

44.2 KB Created: 2020-10-31 06:54:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b7c6e3b591953c4f484b555e2d888905 SHA-1: 1fbc3d06b4ea2df5e6ace3e6cf7aabfbef896003 SHA-256: 8d1c4efba0351642f2a7ff3d6f28517604eacdbd21134961d6b167dfee804b5c
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 host other PDFs. One of the primary links directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'marine science classification study guide' and the malicious URL, suggesting a lure to a phishing or malware distribution site.

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=marine+science+classification+study+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384299/normal_5f964a1ea6511.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369786/normal_5f9ce1f3e51b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6468/8292/files/xagobewosufajevupidap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf2e8b24-1239-482e-a1d6-fdf881ed4fb7/the_last_colony.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7438e40f-a93a-4864-9fb8-7bd6b0a85c74/45746263354.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/87916945082.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/sandy_ridge_elementary_school_sandy_ridge_nc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4435c55b-c1a0-4279-a574-4f105edb822d/diraboreloj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70b8e3df-6ecd-48d4-a7f1-a72c147e963a/30878921521.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/27347242427.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/vomizivupapumobe.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/la_verdadera_historia_de_hello_kitty_en_letra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b661437-42cd-4fce-8739-e5ce8e4b8e02/52499731632.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/the_seven_spirits_of_god_by_pastor_chris_oyakhilome.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0E 5296 bytes
SHA-256: d2e09fac1cbf103af10d4d87b76353a242274e6ce9975f600ae49aa07ef88809
font_01_sfnt_off00007d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D3A 11168 bytes
SHA-256: ba1cd7c9c790347546bb6f619e953565854a3c9df0eb248d2032ef30bcf7621e

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