Malicious PDF — malware analysis report

Static analysis result for SHA-256 8812b131ebe1b2e7…

MALICIOUS

PDF

37.4 KB Created: 2020-10-26 13:26:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 985d02523a65c213e8df8c97aa197f64 SHA-1: 3a533eb40b97dfae03dbbc3a9c634ed1c06dc181 SHA-256: 8812b131ebe1b2e74fdb61bcf38c7868e2a73085b88c1fd2a08dc4765ae71fb5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious due to a high number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One URL, https://gettraff.ru/pify?keyword=cnc+lathe+tool+holders+pdf, is identified as a known malicious redirector. The document body contains garbled text and a reference to the malicious URL, further supporting its malicious nature.

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/pify?keyword=cnc+lathe+tool+holders+pdf In PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/22555.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/76616.pdfIn PDF document text
    • https://tewubituzidebu.weebly.com/uploads/1/3/4/3/134359488/rafodapu.pdfIn PDF document text
    • https://bebamewikirebu.weebly.com/uploads/1/3/0/8/130874540/8627409.pdfIn PDF document text
    • https://kakawugob.weebly.com/uploads/1/3/0/9/130969990/lojovefukajevipi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f8ab5af42a21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369331/normal_5f8acc5529701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411922/normal_5f9575d91ba49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380073/normal_5f8c9e7fcf1df.pdfIn PDF document text
    • https://gutomaxitokivi.weebly.com/uploads/1/3/1/3/131383747/guxasirewizoluzir.pdfIn PDF document text
    • https://paduxadoduxim.weebly.com/uploads/1/3/0/7/130775016/dozilevegoj.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/dbbab4ecdfa.pdfIn PDF document text
    • https://wonigebegi.weebly.com/uploads/1/3/1/6/131606731/9616235.pdfIn PDF document text
    • https://kexinebig.weebly.com/uploads/1/3/4/3/134338338/2786082.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/5e32da24-3102-42cc-849a-07771a8ca5eb/77530033157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9a206b3-c962-4b79-9209-c44e882d6415/vivipogewujesevoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1956802c-6b00-4209-a569-db54b2a989c8/bovijixodimoteki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98510598-6951-4f4f-b2bb-9bc3ff510584/43623868654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36819776-75d0-4a56-bc1e-1f62748abcdb/21555878757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddd2a04d-932e-42aa-946a-ac2336922295/26429165851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a0273f5-612b-4f97-8222-84bff938e902/tm_gi_qua_m__ninh_thun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af60d2c0-327e-44c2-acf2-d0709509388d/ropusaforulizabapumuwipi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7003/6412/files/parkinsons_disease_australian_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/84534485390.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5008/1690/files/present_simple_negative_form_worksheet.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_off0000528f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x528F 5148 bytes
SHA-256: c455dcbef30c0c151dbaab538ef773c56f3e7c206abac1e00b0ccaf0627357a6
font_01_sfnt_off000063fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63FD 11124 bytes
SHA-256: 22346ff4f0a861ca033248af2e37ab529a08c4a23e622ae8979261d20eb0a292

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