Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcfe8cdb7ba9b1b2…

MALICIOUS

PDF

45.8 KB Created: 2020-09-17 21:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28e6cbaae9b9a438e8b03b976f4bae19 SHA-1: bc28a764231b2d696c2afe6bbd52b3c1733f7d91 SHA-256: bcfe8cdb7ba9b1b267eeeb79b3735874d7bff68d1eea574b23272c6f0b06dbed
154 Risk Score

Malware Insights

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

The PDF document contains a lure for downloading pirated content, specifically mentioning '50 sombras de grey'. It embeds numerous links, with the primary one pointing to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to distribute malicious content.

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/wix?keyword=descargar+pel%25C3%25ADcula+50+sombras+de+grey+gratis+para+android
    • http://pofukaf.shawnmooreart.com/uploads/1/3/2/7/132711947/1048484.pdf
    • http://lilunedir.cmzpictures.com/uploads/1/3/1/4/131437100/17a3e51f0b3.pdf
    • http://jemudajo.shinyaxe.net/uploads/1/3/1/0/131070291/b89cc344.pdf
    • http://files.tssparking.com/uploads/1/3/1/3/131380184/962e2b35fdc95.pdf
    • http://pedorumed.mrsoneyscomputerlab.com/uploads/1/3/1/4/131452836/kasusaretej-marolujazikugis-donotizapi.pdf
    • http://nulabexab.westernanimalresources.org/uploads/1/3/2/6/132696063/patoxiwowu.pdf
    • http://gusizasot.fbtactical.com/uploads/1/3/0/7/130739017/23093.pdf
    • http://files.oldportcandyco.com/uploads/1/3/0/8/130815381/3c686a458fa65.pdf
    • https://cd26fe13-91a0-4f0c-8613-4e9120c3f3f2.filesusr.com/ugd/de3d83_1f07480de376416aaefd4b1c70e0fafe.pdf?index=true
    • https://b513b5a0-02f9-466b-b0d7-dc9d84107f6a.filesusr.com/ugd/eaf48f_b56e78eab1824683b5a01bf331971282.pdf?index=true
    • https://daaf84e6-7fee-407e-b337-4fc8d63da80b.filesusr.com/ugd/e42c35_00558bf7ceb54446a21c2281c5e3f8c8.pdf?index=true
    • https://e70e8d50-83ba-409d-9ea5-94e71ed9be68.filesusr.com/ugd/15cd4d_a363cd37b86c4a7c9328e65783c04291.pdf?index=true
    • https://6f8dfd66-c51f-4d65-a928-24f503bea29c.filesusr.com/ugd/1479de_4ff1c6876b24428ab5dd05cb235737af.pdf?index=true
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054a0.bin
ef0ff104ea44b4f76f2e317c05d944ff73adab4e11d451763276b796cfc564ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54A0 2868 bytes
font_01_sfnt_off00005ed2.bin
3e3330ac92c1612cd6f2569beaa4639c00c24041f8bb73438260bafb6f378d1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED2 5836 bytes
font_02_sfnt_off0000729c.bin
7222e23f7bf364b3be9a227158718c41a4eb6967bdf711f711ceb0c2b8b3749b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x729C 11664 bytes
font_03_sfnt_off000098a5.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98A5 4324 bytes

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