Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fbfdf5605f99097…

MALICIOUS

PDF

35.2 KB Created: 2020-11-03 02:38:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3ce8fd126d27e1e43b0c55e586afbd08 SHA-1: b193c44681fe22c64be5ee2978baef18b1e20c34 SHA-256: 9fbfdf5605f99097beca08daeabf7cba945f694107ecbf85f3e079feeb9622b2
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirector infrastructure, indicating a link farm or SEO poisoning attempt. One prominent URL, https://cctraff.ru/aws?keyword=seneca+middle+school+mi, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/aws?keyword=seneca+middle+school+mi In PDF document text
    • https://purowuma.weebly.com/uploads/1/3/4/4/134472698/1e8291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454302/normal_5f9fd1f9218ba.pdfIn PDF document text
    • https://xebexusutawa.weebly.com/uploads/1/3/4/5/134502291/41dfcd8ec5923.pdfIn PDF document text
    • https://tafuposavibado.weebly.com/uploads/1/3/4/0/134017079/xidofubogim-gokoxetugo.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/a825bd53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379043/normal_5f9d09a6574c0.pdfIn PDF document text
    • https://woxejisuwu.weebly.com/uploads/1/3/4/3/134322210/4267459.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/fibaxizimudez.pdfIn PDF document text
    • https://xijonezamo.weebly.com/uploads/1/3/1/4/131407630/2293316.pdfIn PDF document text
    • https://jowesezowu.weebly.com/uploads/1/3/4/3/134366841/losivobomepefosobu.pdfIn PDF document text
    • https://nokemodikobo.weebly.com/uploads/1/3/4/3/134308311/6d69891d1d.pdfIn PDF document text
    • https://kivofijola.weebly.com/uploads/1/3/4/3/134309380/vekexel-zobemepivez.pdfIn PDF document text
    • https://folukufisika.weebly.com/uploads/1/3/1/3/131384255/boxabefi_jamerigejasiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jozetej/dragon_ball_z_dokkan_battle_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/nujijawigonevudenup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7934/2526/files/8691271608.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4518/9310/files/61324600309.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_off00004b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B12 5184 bytes
SHA-256: 6a1e1dadef7b03612d6373cf0c753c812efe8662ae400b91ac866f20d84ee6cc
font_01_sfnt_off00005c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C8C 10428 bytes
SHA-256: eb6481668dc92328b48943eef82f340ef91023aedb1c802ccd652534449e7421

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