Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad586ab3219f576…

MALICIOUS

PDF

62.6 KB Created: 2021-01-02 23:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c9fcd93ebc479ba1fd6d2861095ba8be SHA-1: 461fe6bbe1ccde6ff3d63b2dd91998bb1e1834a1 SHA-256: fad586ab3219f5762db877a1f4de9125d8a456e9ff937322aba15085363a25c0
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, appears to reference a 'school yearbook' and includes metadata from wkhtmltopdf, suggesting a lure to disguise malicious links. The presence of multiple external PDF links, some pointing to S3 buckets, indicates a potential link farm or distribution mechanism for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/123?utm_term=greenway+high+school+yearbook In PDF document text
    • https://cdn.sqhk.co/rojisixel/Vgiidgc/snapchat_login_online_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376125/normal_5fa5a8db745b9.pdfIn PDF document text
    • https://xebokedobonu.weebly.com/uploads/1/3/4/7/134719403/vutebezotasisasonale.pdfIn PDF document text
    • https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/zokunuseleg_jixuzimigaxub.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/ggXjfV1/ninja_foodi_blender_vs_vitamix.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/kawotexulozax/wutogebakumiwasitopukiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10f39a87-4406-42a5-bd36-7358159a9f3f/58007360712.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/25836521117.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/34949701816.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/5575549150.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/rirudavupewexaroxutes.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/dormouse_facts_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/medadele/el_hombre_que_calculaba_original.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67C 5488 bytes
SHA-256: 542490a59ff45b12d05aee165af5a1c5c6300f4a08264e81d8dae1c2e177b63a
font_01_sfnt_off0000c93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93E 10744 bytes
SHA-256: 6b18da89c2e1c5a0923fabea957d8088bd9d98e755b675954605fad09ff9804b

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