Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b2ebe7956e24bd…

MALICIOUS

PDF

40.9 KB Created: 2020-11-07 01:47:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b5cc59111431c838033a4c9ceb8339d5 SHA-1: ff90eaddc7629b0fb792648b48bc3ca0408f1581 SHA-256: 20b2ebe7956e24bdb16a2990d18a83fca854216b3bf2d9d9f28de1e7f821ab58
184 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body itself is heavily obfuscated and appears to contain a URL, suggesting it is designed to lure users to external, potentially malicious, content. The ML classifier strongly indicated maliciousness, supporting the heuristic findings of a malicious redirector and a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/aws?keyword=pse+decree+hd+compound+bow In PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/cb7f6d77dab06.pdfIn PDF document text
    • https://gekeforoka.weebly.com/uploads/1/3/1/4/131438206/b3fe9719d.pdfIn PDF document text
    • https://wejibuxod.weebly.com/uploads/1/3/0/7/130740202/xeriwokurikitij_mufarazixaku_filedupepokale_zidapora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465006/normal_5fa5e0644c316.pdfIn PDF document text
    • https://rariborujur.weebly.com/uploads/1/3/4/4/134443596/nubemugokovila.pdfIn PDF document text
    • https://bepugodaz.weebly.com/uploads/1/3/4/2/134236138/tujomukexeja.pdfIn PDF document text
    • https://kekidebas.weebly.com/uploads/1/3/4/6/134633427/6994646.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cff0fb41-5dd5-48ee-bb90-9cf81d699aaa/soviraxege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f9aa30b-35e0-4200-87dd-0285e142ba16/gavuravebewupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42409691-ebdd-4daa-bbe9-db7ae4700761/lyrics_to_seven_years_old.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c51bb2de-e648-4d30-87a6-cda9c05a2d4b/panera_bread_case_study_crafting_and_executing_strategy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f871abc3-e3e1-46cb-91f9-d9fb5b076fbb/bafubebevise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99427d0e-ac24-4b0a-8f22-bd56a6814788/kamidori_alchemy_meister_material_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a6c7fbe-8f84-4c4e-afbf-555f31aae511/70894641638.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_off00006278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6278 5304 bytes
SHA-256: 4386c8c443c592a9ec76bcbc1505a20efda081ae2a186cd284a43bb758a2373b
font_01_sfnt_off00007463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7463 10216 bytes
SHA-256: b0be453dd0846edf8099bc435b6b1eebc5eb4633fb70768d21a1e8987a28679c

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