Malicious PDF — malware analysis report

Static analysis result for SHA-256 d538bf8328e72581…

MALICIOUS

PDF

35.3 KB Created: 2020-11-09 13:41:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ecd8db97118082ad68977a370bb7a0ed SHA-1: eba1e0adb6e78b20ed511641674ff5e791b70608 SHA-256: d538bf8328e72581312f548826694dd6fca21f2e9000b2135cb0e95cfb28c55d
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The ML classifier strongly indicates maliciousness, and the PDF contains an embedded URI pointing to a suspicious domain, traffnew.ru. The document body, though heavily obfuscated, contains a reference to this URL, suggesting it's intended to redirect the user. The presence of numerous other PDF links, many hosted on disposable platforms, further supports a link-farming or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/strik?keyword=ace+bandage+clips+cvs PDF link annotation
    • https://kizujaxaluw.weebly.com/uploads/1/3/4/3/134393650/e773b5c.pdfIn PDF document text
    • https://kesevaze.weebly.com/uploads/1/3/1/3/131383297/91339.pdfIn PDF document text
    • https://zovijewef.weebly.com/uploads/1/3/4/4/134400079/8e50bc6a9839.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_5f8828fe649f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f95a8d5b136d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_5f9d57f7f3172.pdfIn PDF document text
    • https://biwobere.weebly.com/uploads/1/3/4/3/134372714/6ea4891576d3cc1.pdfIn PDF document text
    • https://joruluzadazalit.weebly.com/uploads/1/3/4/6/134673717/midewimawekixub.pdfIn PDF document text
    • https://lijipowurop.weebly.com/uploads/1/3/4/3/134314174/betewipebamugi_zonanem_dukuxudivig.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/3693bb90-6757-4546-922e-364e43931ab4/tuzategewis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e3ca328-d57c-465a-b856-237ef31d1bf3/xapamasoxisowosima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6580dfba-c645-4b61-a047-71803980c39e/xuxarazan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b08ced0-c328-4fb5-bcf0-b60bb6ea08bd/67403490647.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_off00004b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B11 5332 bytes
SHA-256: fa0f8cc2671dbb4d2dba7e9268ee7339b3de010a7211e096910725d415a4cbb0
font_01_sfnt_off00005d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D4C 10144 bytes
SHA-256: 9a3cfc29eb11e7079f104312c547059928050756cbb95e26fefade77edd721cd

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