Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3c4b67ea6ad1da…

MALICIOUS

PDF

34.2 KB Created: 2020-10-31 02:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8c5cf44ca2882455e84dea1e1187f4d SHA-1: 7a90cac502bdbf36971b0f9da6eb76fa34a0a3ff SHA-256: 6f3c4b67ea6ad1dab0f51bb8d3a9690dfe140d227d1c1880436c7a430a43f238
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to known malicious redirector infrastructure or link farms. The document body text, though heavily obfuscated, contains keywords like 'offensive t shirts nz' and references to the authoring application, suggesting a lure. The presence of numerous external PDF links indicates an attempt to direct users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://ttraff.club/123?keyword=offensive+t+shirts+nz
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/059d55fbff3.pdf
    • https://xefosujusiro.weebly.com/uploads/1/3/4/0/134042031/videwowuzototavokada.pdf
    • https://zetaxufonepijak.weebly.com/uploads/1/3/4/3/134353616/8672bc2053.pdf
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/vuluzarik-nunakaf-tejapirofog.pdf
    • https://femevidawivuk.weebly.com/uploads/1/3/1/0/131071063/wirimodere.pdf
    • https://cdn-cms.f-static.net/uploads/4383913/normal_5f9ae371d57a0.pdf
    • https://sobegivi.weebly.com/uploads/1/3/4/3/134311910/nifet.pdf
    • https://cdn-cms.f-static.net/uploads/4413243/normal_5f9c97bdd6b52.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0499/9734/9023/files/rosigesozofafoketib.pdf
    • https://cdn.shopify.com/s/files/1/0501/6712/0024/files/64599192957.pdf
    • https://uploads.strikinglycdn.com/files/1f341d92-d7e1-4f03-b354-7d4501846e3b/nipikaruxevuwunajasov.pdf
    • https://uploads.strikinglycdn.com/files/e133e1ed-4439-43a6-8685-713345b868a8/jepatadupimebolopo.pdf
    • https://uploads.strikinglycdn.com/files/2929dfdb-deb5-472e-ac0d-7ee04d9cf68a/pci_simple_communications_controller_asus_a43s.pdf
    • https://uploads.strikinglycdn.com/files/25917ec8-6554-4656-a304-1f8990cf2819/harry_potter_et_philosophi_lapis.pdf
    • https://uploads.strikinglycdn.com/files/801c2f0c-5491-41a0-89e7-8b0d957f52ee/69369953780.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000494e.bin
cd4dce43e1675f6148a48d67185d0eff3284172d3f9cee5cbc880a1042ee2880		 pdf-font-stream PDF embedded font (sfnt) at offset 0x494E 4752 bytes
font_01_sfnt_off00005987.bin
b796f9f61a366d503d8080d7010af4d7c230dffcacb997685a178dc822180f1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5987 10400 bytes

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