Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f42e0de54404bdd…

MALICIOUS

PDF

55.6 KB Created: 2020-10-26 18:43:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2c2056ed310d8bb30005e79b48669e78 SHA-1: 4eda611f7dd7ebdc61dc8e0bfcda7181a14618f1 SHA-256: 6f42e0de54404bddfa7172fc1d6e167508be95b686be7d9fa00f1045ee6cd841
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to disposable hosting services and ultimately lead to a malicious redirector. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to obscure the final malicious destination. The primary malicious URL identified is https://ggtraff.ru/strik?keyword=mud+on+the+tires+guitar.

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/strik?keyword=mud+on+the+tires+guitar In PDF document text
    • https://soxixafefude.weebly.com/uploads/1/3/4/4/134434462/mapezu.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/4918653.pdfIn PDF document text
    • https://rejigebejone.weebly.com/uploads/1/3/4/4/134462336/4469166.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/zisobujudud.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/xuvizilutozakuli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374374/normal_5f943b5cc9370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374359/normal_5f8fe831023ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404745/normal_5f957f003c56b.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/4ba1372a-480b-4675-99e8-9ff9fdf35b15/kagej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48b339d8-01bc-4f6b-9bd6-3018e60d4ddd/96007220046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad18e42f-8a0e-421a-870e-b75e2abda344/povevaxexugexuguwami.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/vector_addition_physics.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/tutorial_adobe_premiere_pro_cc_bahasa_indonesia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a49f98ba-57e1-45b8-b965-eb2875842e19/jedaligolupinebusagole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3ee865-912b-4867-9593-8caccc94ea0d/voxumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d83eb58d-c56c-4bbf-9357-fab5ca0a3b62/honda_eu2000i_spark_plug_cap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9579/4857/files/98220080830.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6223/1201/files/android_studio_code_formatting_settings.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7951/5291/files/all_fnaf_animatronics_4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9066/3832/files/21620544145.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_off00009bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BC1 5060 bytes
SHA-256: 05e09b67914380985a074e2c1d3f6c156545940e2674eac16caa6852d8e687c3
font_01_sfnt_off0000aceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACEB 10632 bytes
SHA-256: c7666d29a87953c3f504c19fec00e4175d1c42fded871dbd1c13a08446789254