Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af0643d7aab663a…

MALICIOUS

PDF

42.7 KB Created: 2020-04-04 15:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 64b751e474da111ddcb934f8f447e4c0 SHA-1: 7c7d66d06557c9614d07f557e63d0603dc80c28d SHA-256: 3af0643d7aab663a13d784955d8292ef578ce496776b9f9d175a83f9a3bdacbd
96 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, indicating a link farm or SEO manipulation tactic. The primary heuristic firing, PDF_SEO_LINK_FARM, strongly suggests this malicious intent. The document body, though heavily obfuscated, contains URLs that are also present in the extracted URL list. No scripts were extracted from this sample, limiting the analysis of direct payload delivery mechanisms.

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://rodchatatickets.com/uploads/1/3/0/6/130604042/130604042.html#eheim+ecco+pro+200+spares PDF link annotation
    • http://cahabaclothing.net/uploads/1/3/0/4/130491271/1917703.pdfIn PDF document text
    • http://swamiofsearch.com/uploads/1/3/0/4/130435547/bufikikotavevakuba.pdfIn PDF document text
    • http://petershenkinlaw.com/uploads/1/3/0/4/130476594/3876900.pdfIn PDF document text
    • http://basket24h.com/uploads/1/3/0/6/130604657/9183566.pdfIn PDF document text
    • http://azlandscapers.com/uploads/1/3/0/8/130874042/c4ebaaf6420308.pdfIn PDF document text
    • http://edgeswellness.org/uploads/1/3/1/0/131070442/foruxagiba-pedipiwuw.pdfIn PDF document text
    • http://seattleseniorcounseling.com/uploads/1/3/0/7/130776454/xejizulanex.pdfIn PDF document text
    • http://hostmaster.barcelona-museum.de/uploads/1/3/1/0/131069934/fabuwukukokitev_tavexix_podorik_ginixu.pdfIn PDF document text
    • http://finnishspitzinternational.com/uploads/1/3/1/4/131437174/lanipidamodus-navobazadudeso-vutosade-gewinof.pdfIn PDF document text
    • http://greaterhoustondems.com/uploads/1/3/0/7/130775050/daripij-mupofivafizawed-zozusubawezafed-gijir.pdfIn PDF document text
    • http://gonewithgroms.com/uploads/1/3/0/4/130478484/8354257.pdfIn PDF document text
    • http://addycakescookies.com/uploads/1/3/0/7/130776175/musevet.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68CC 8424 bytes
SHA-256: 0bdfb8d35093d3550a2a7ceaf041eb6b06eb533792779166397ce65d5e43853b
font_01_sfnt_off00008920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8920 16036 bytes
SHA-256: 779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63