Malicious PDF — malware analysis report

Static analysis result for SHA-256 f389eab78cc49106…

MALICIOUS

PDF

37.0 KB Created: 2020-04-09 00:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1d3a85431fe5e117ad99844f95a15577 SHA-1: 13ed6b3b15f410b02a1d581244596cb3a8658b7b SHA-256: f389eab78cc49106ec74fca3e4a50ea5a7cb9f0dde37915eba26630f71e87195
94 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO abuse tactic. The document body mentions 'Gangstar rio apk obb highly compressed', indicating a lure to potentially malicious content. The ML classifier strongly flagged this PDF as malicious.

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://psycologyandediting.com/uploads/1/3/0/6/130639845/130639845.html#gangstar+rio+apk+obb+highly+compressed
    • http://red-casino.net/uploads/1/3/0/3/130323181/kogegisi_navodoxegavane_tofur_perutidowodavuw.pdf
    • http://buildbakeandbehappy.com/uploads/1/3/0/6/130604179/9852316.pdf
    • http://family1stpropertiesllc.org/uploads/1/3/0/9/130968972/sozuriroram_murajikutononen_mubazamevejiwe.pdf
    • http://carmencavallaro.com/uploads/1/3/0/9/130969910/6192478.pdf
    • http://fariasmultiservices.com/uploads/1/3/0/8/130874474/tilowopagapozavez.pdf
    • http://realchewymcgee.com/uploads/1/3/1/4/131453984/218c6cac70f3f.pdf
    • http://gregoriodelolmo.com/uploads/1/3/0/6/130604767/lutowuw.pdf
    • http://kbgamesllc.com/uploads/1/3/0/7/130739348/7694231.pdf
    • http://saraandrewswriting.com/uploads/1/3/1/4/131438142/libetiwo.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b40.bin
e4b3ce425247ca512b19e5379d0408eef0e5deef4f1a5a163fcd0501ab35aae7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B40 7936 bytes

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