Malicious PDF — malware analysis report

Static analysis result for SHA-256 573f5f15cee64d2a…

MALICIOUS

PDF

51.7 KB Created: 2020-04-06 13:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d8fa5ec0422445b62cc1a4e4092d8761 SHA-1: b929793921eee0f0d59de9abc56358fd9dc181b0 SHA-256: 573f5f15cee64d2ad463748841626024a39487f98df449a7e8309fb53d460c82
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier with high confidence. It contains a large number of external links, many of which point to domains that appear to be part of a link farm. The document body contains a Spanish phrase related to a Coca-Cola advertising campaign, likely a lure. The primary attack pattern involves directing users to potentially malicious external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jenntreado.com/uploads/1/3/0/3/130379561/130379561.html#campa%C3%B1a+publicitaria+de+coca+cola+nombres
    • http://by-the-foot.com/uploads/1/3/0/6/130604911/lefizewifulu_nofod_sidokogi.pdf
    • http://chelseaishungry.com/uploads/1/3/0/7/130738871/dojawubasutu.pdf
    • http://mjbprolightsandsounds.com/uploads/1/3/0/5/130590508/romujikujufarof.pdf
    • http://hipnosremotional.com/uploads/1/3/1/4/131406433/raguguvowuta-xisapep-muwob-laruzo.pdf
    • http://valleyembroidery.net/uploads/1/3/0/6/130621312/4487684.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_off0000889d.bin
353806ef30c36db4ad9bb46113bc8ba7b86d2a765275af031da6918ad37991a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x889D 9512 bytes
font_01_sfnt_off0000aaef.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAEF 16036 bytes

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