Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae99f7ff8742c8b1…

MALICIOUS

PDF

66.6 KB Created: 2020-11-18 16:57:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92dcc050c4bd91e9ec1d03b02c20395e SHA-1: 930d63fc334e9cc3b3f6500a2efe6b63eaed6e57 SHA-256: ae99f7ff8742c8b16c8d3cb8c75ad3194489fcc652866739bbe1270db46bfdc6
96 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding a large number of external URLs, with one identified as a potential malicious redirect. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. While no scripts were explicitly extracted, the presence of numerous external links suggests a potential for redirecting users to malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://trafficel.ru/123?utm_term=biblical+courtship+pdf
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/257577.pdf
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/bcb576e4.pdf
    • https://jusemeki.weebly.com/uploads/1/3/4/5/134506960/8f3d2020.pdf
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/f3467ef29e39.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/313e565b-a8d6-40fb-8b51-92bb3f58ee66/marine_ecosystem_plants.pdf
    • https://uploads.strikinglycdn.com/files/56b3ce98-f0dc-4d55-b13e-afb27b3ea34a/21274434803.pdf
    • https://uploads.strikinglycdn.com/files/1d2f3224-a374-4c7d-b674-3781029528d1/88967031647.pdf
    • https://uploads.strikinglycdn.com/files/5f8b650c-8586-4fa2-95b5-882f9112c011/10116287037.pdf
    • https://uploads.strikinglycdn.com/files/6748e9a4-cb49-4906-bb02-ba71f9b59a38/45031070452.pdf
    • https://uploads.strikinglycdn.com/files/dd5a12a9-a1de-4908-a920-5ec1cf3f4b61/gomilamopas.pdf
    • https://uploads.strikinglycdn.com/files/495c1204-15e9-4eb1-be72-9da38ce71ed7/aegis_x_geek_vape_user_manual.pdf
    • https://uploads.strikinglycdn.com/files/9a991706-af9c-4590-a1d6-d1e8729fcdf5/tubizes.pdf
    • https://uploads.strikinglycdn.com/files/9a7f1920-58b0-4925-b347-3ef484937cae/75418339619.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_off0000c939.bin
b573e02a21cbd78e8e563c19b7e327fad0aee2109c24722654ac60b9077f9988
pdf-font-stream PDF embedded font (sfnt) at offset 0xC939 5432 bytes
font_01_sfnt_off0000dba5.bin
831651de50e57d692d363c3269bfb9cb3aa64801814d11ff38d6ffe26a1a6dab
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA5 10176 bytes