Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c243dc1bd63d195…

MALICIOUS

PDF

62.3 KB Created: 2020-04-11 08:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: db425f60989c639882a524e82d04ec9e SHA-1: 5dcae7b486c18789ee3b54613beaa1ff79060ee8 SHA-256: 8c243dc1bd63d1954a4e56958682999c83511b25d8f9e8cb2a349ec27e063140
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated with numeric slugs, indicating a link farm or SEO abuse tactic. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier strongly indicated maliciousness, supporting the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://74-123-78-29.mgwnet.com/uploads/1/3/0/8/130814252/130814252.html#belajar+hangul+pdf
    • http://wilbrahamantiques.com/uploads/1/3/0/8/130815115/potuburuwigemurepewi.pdf
    • http://aocconsultoriayestrategia.com/uploads/1/3/1/1/131163516/peposujeriti_kukatogew_babeziledunudo_buzozapivuv.pdf
    • http://ronaldsnorriscpa.com/uploads/1/3/0/4/130435791/zoril_winonekez_gofutidapuw_kevumo.pdf
    • http://tnsockcompany.com/uploads/1/3/1/4/131406735/gelufapakit.pdf
    • http://allianceconstructionllc.com/uploads/1/3/1/4/131453194/gixokepufam.pdf
    • http://stacycoenod.com/uploads/1/3/0/7/130738513/tikan_suwibel.pdf
    • http://ke-heslop.org/uploads/1/3/0/2/130270980/8824671.pdf
    • http://adventureswiththebartels.com/uploads/1/3/0/6/130604767/biberuxufikepofirak.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_off0000ab94.bin
575188fd19325a23009f4954e5f5e47bf2f1e80384a761b5bc0e7bff7cde073b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB94 8956 bytes
font_01_sfnt_off0000cd8f.bin
7b3aaed60a10db926dfbfb74694ca8c57092dabd7a98ca76cef69391948566c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8F 10260 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.