Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0f99efefbb7fed…

MALICIOUS

PDF

44.5 KB Created: 2020-10-25 23:37:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: df1abbebb6176ae41bee4b36dd59cea6 SHA-1: 5270ab7bc43766f160bbeade642de5a029d40e76 SHA-256: 5d0f99efefbb7fed80015aba36fa52cf46d14450750bded8ee51be94442731bf
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to various PDF files hosted on disposable domains, indicating a link farm. One URL, https://gettraff.ru/aws?keyword=gym+workout+chart+for+beginners+pdf, is identified as a malicious redirector. The ML classifier also flagged this PDF as malicious with high confidence.

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://gettraff.ru/aws?keyword=gym+workout+chart+for+beginners+pdf In PDF document text
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/kenilirokaju_ximojukaf_segavev_powizetu.pdfIn PDF document text
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/mazetudutawagum-dolod.pdfIn PDF document text
    • https://dokodajibebabek.weebly.com/uploads/1/3/2/3/132302773/dunufuresetujaburoz.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/308492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374536/normal_5f8a6c218c6d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373797/normal_5f92c80bbf947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377116/normal_5f9432f175066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381302/normal_5f8f187ed175c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377410/normal_5f945155d409b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373243/normal_5f91e6d2ef285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369174/normal_5f8d0abed87cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405179/normal_5f924af1a9b6a.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/bubirisonisa_fedanalesi_fikafugegira.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/tixobenudofezibet.pdfIn PDF document text
    • https://tiwilofudux.weebly.com/uploads/1/3/1/6/131606348/7074581.pdfIn PDF document text
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/figasivumo.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/fec1965e-c09d-4232-9f6d-67167a4f0f1e/fnaf_world_halloween_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4614ed00-6e67-47c2-9e98-f32d31050ed5/nazuxufigajegavijesol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1390b5a6-df5e-44a4-bf95-0f7f7ea0c6d4/mulol.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/zimsec_a_level_physics_syllabus_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/93044017149.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/befivuzonabifexiruwituko.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_off00006b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B74 5968 bytes
SHA-256: 2f372320a27e2ed4bb80a707d13138019b06915ceda38da4ed7a395ca10040d1
font_01_sfnt_off00007fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB9 10860 bytes
SHA-256: 32ba9e4d70208a12f3eb81a26c13c961e7b8cc04adda1ee5deeee61d09970d79