Malicious PDF — malware analysis report

Static analysis result for SHA-256 4381ccbf03ca65f3…

MALICIOUS

PDF

61.5 KB Created: 2020-04-07 21:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cb8ae23bc7c6470da8bd4d42d0d6173f SHA-1: 156c889d3c52da5fc90d805d64e5a75f4e6380be SHA-256: 4381ccbf03ca65f3d605767ce82fbdce81349ab2cb4f67eedafbf76d07a9edf5
94 Risk Score

Malware Insights

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

The PDF document contains a significant number of external links, many of which point to other PDF files hosted on various domains, indicating a link farm for SEO or malicious redirection. The document body text, though partially obfuscated, mentions 'ebook free download', suggesting a lure to entice users to click on these links. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://simplelegalinc.com/uploads/1/3/0/6/130620491/130620491.html#up+the+organization+ebook+free+download
    • http://nhrivals.com/uploads/1/3/0/7/130775219/biketafizo_vuwevurofaf_jomiretuj_zaris.pdf
    • http://craymuseum.com/uploads/1/3/0/4/130483345/8225070.pdf
    • http://matthenley.com/uploads/1/3/0/5/130551174/rupafawitetof-mejulumud.pdf
    • http://jmglassandinstallationcorp.com/uploads/1/3/0/2/130289371/391e6ec71471.pdf
    • http://krunchforacure.com/uploads/1/3/0/2/130292148/rorixa.pdf
    • http://mylovesonline.com/uploads/1/3/0/2/130287929/75703.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_off0000b4f8.bin
620fd8b4e258fac3dc02a4e15bf840a58c124fa93f329b2a87a1f4b008c62834		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F8 6552 bytes
font_01_sfnt_off0000c51b.bin
78907d2b367cbe9dc3017c16c7176713dfefe668ada821dc09476f0e269fdff9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC51B 8876 bytes

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