Malicious PDF — malware analysis report

Static analysis result for SHA-256 263f24ac3f23b963…

MALICIOUS

PDF

45.2 KB Created: 2020-03-28 11:54:47 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 37b273ba359c564e56000b342b2fdd07 SHA-1: 3533d1239b7c95559c93fec55d6d747bc723b3c4 SHA-256: 263f24ac3f23b963c2d6e18e2888428fb0552b106b9defd82efb51089705f165
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or redirection scheme. The ML classifier strongly flagged this sample as malicious. The primary attack pattern involves directing users to a network of potentially malicious or deceptive content hosted across numerous domains.

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://lifestyleshop.nl/uploads/1/3/0/6/130639172/130639172.html#binomial+expansion+negative+square+root
    • http://airlinesattorney.com/uploads/1/3/0/2/130288514/3fad5f0d.pdf
    • http://acupuncture.doorstepvetaustin.com/uploads/1/3/0/8/130874076/guviro.pdf
    • http://shopunicycle.com/uploads/1/3/0/8/130873908/05f50eace9.pdf
    • http://www.treeoflifewellness.info/uploads/1/3/0/8/130873737/nizak-wugenapigapepo.pdf
    • http://xpeed8.net/uploads/1/3/0/4/130435657/d0574e9a37a0c4.pdf
    • http://tructable.com/uploads/1/3/0/5/130540882/zogilejema_bagabuditis_detomukorowak_basoxabudab.pdf
    • http://2614ogleton.com/uploads/1/3/0/4/130479008/redof-pewonavazebip.pdf
    • http://pressonprincess.com/uploads/1/3/0/6/130604516/2103899.pdf
    • http://jennifermonson.com/uploads/1/3/0/3/130323836/dibovux_siregitoduxofup_milud.pdf
    • http://originalpancakehousesavannah.net/uploads/1/3/0/6/130620756/ludebe_kunasupi_jaliweralafiriw_jezagobefotus.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_off00007ce4.bin
cba05d680f3c014527d0e14ea8e9f75e78f7781c7d285d997643444613a26289		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE4 8444 bytes
font_01_sfnt_off00009dbd.bin
e2a609504f31aba74360c8f97aead3d8f97c76e888a653261413c8bef59e3205		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DBD 2884 bytes

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