Malicious PDF — malware analysis report

Static analysis result for SHA-256 902954a2c81ea9bf…

MALICIOUS

PDF

56.5 KB Created: 2020-04-11 09:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e2f1fdb32a85077dff0b3a5ad08ba2c4 SHA-1: 63029c3aec54846e8d13854680c6ec27e0fe9553 SHA-256: 902954a2c81ea9bf1f9ba0e3213b58885a29e94db5d519199183cd4a642d366e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF documents. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, indicating a likely attempt to manipulate search engine results or distribute malicious content through a network of linked pages. The ML classifier also strongly suggests maliciousness. The document body contains a misleading title about suicide rates dropping, which is likely a lure to encourage clicks on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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 http://5pointauto.com/uploads/1/3/0/6/130605122/130605122.html#suicide+rate+drops+to+0
    • http://gt-mgmt.com/uploads/1/3/1/0/131070866/serebeliduwu.pdf
    • http://richardbrooksinvestigations.com/uploads/1/3/1/4/131438459/862a97bb.pdf
    • http://pearsonsherbsbeautyessentials.com/uploads/1/3/1/3/131398077/kilaluwo.pdf
    • http://osteo-tarare.com/uploads/1/3/0/9/130969774/68245.pdf
    • http://jasongerstenkorn.org/uploads/1/3/0/6/130604720/xexutosozi_mudaxuduli.pdf
    • http://lollipoptreequilts.com/uploads/1/3/0/3/130313196/5cf3709a9e3c4.pdf
    • http://elementalcanines.com/uploads/1/3/0/6/130620272/95dee1a223fb.pdf
    • http://alley-cassetty.net/uploads/1/3/0/7/130775201/303553f.pdf
    • http://kansaswoundedvetrun.com/uploads/1/3/0/4/130435805/2923458.pdf
    • http://starruchii.com/uploads/1/3/0/6/130605381/7182242.pdf
    • http://dreamyclean.net/uploads/1/3/0/7/130739235/disejesug-wawazedomugoka.pdf
    • http://baileyaviationinternational.com/uploads/1/3/0/6/130605198/9922241.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009e18.bin
542dfe49c693e59744c8d7752022fb0e61700c4540d09236b64172ab5b81eec3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E18 8648 bytes
font_01_sfnt_off0000bf41.bin
b3affdfdfee497c2d3230853582529cf395d265bfdbb8cde7d84ae9c33602211		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF41 16036 bytes

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