Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea4d788b4d7c3c1…

MALICIOUS

PDF

38.3 KB Created: 2020-03-29 13:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e1adc3b4d7b6c9d96ed8d532cab59ee7 SHA-1: 806adce6b99c077a84a7d7904d50d251b3ebb0d4 SHA-256: 0ea4d788b4d7c3c110ad01730276f9fc7a5deed88525c5720403751ac4c80a0a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded URLs, many of which point to other PDF files, suggesting a link farm or redirection scheme. The document body, though partially corrupted, contains text that appears to be a lure for 'Dark souls 2 instruction manual', likely to entice users to click on the numerous external links. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm.

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://graffitigreek.com/uploads/1/3/1/3/131384583/131384583.html#dark+souls+2+instruction+manual
    • http://redstoneloftsuvm.com/uploads/1/3/0/6/130621951/4e238b08067ad.pdf
    • http://thebluemacawnailspallc.net/uploads/1/3/0/4/130477026/noluki.pdf
    • http://vn-nhan-tien-quoc-te.online/uploads/1/3/0/4/130483592/katadaxizitanilitek.pdf
    • http://civilconflicts.com/uploads/1/3/0/7/130776575/e978e7c39.pdf
    • http://mrlkutz.com/uploads/1/3/0/5/130540559/7318686.pdf
    • http://awakenaddictiontreatment.com/uploads/1/3/0/7/130776241/dokozisirulim.pdf
    • http://keeptotheroad.com/uploads/1/3/0/9/130968979/woridozetuzatini.pdf
    • http://dbkstaging.com/uploads/1/3/0/2/130289406/6121678.pdf
    • http://perfectlyimperfectbirth.com/uploads/1/3/0/6/130621373/bf106f9115.pdf
    • http://gloryandpride.com/uploads/1/3/0/5/130539225/nevadutamu-jatewileg.pdf
    • http://kateandersonphotographer.com/uploads/1/3/0/5/130544390/zubotedas_gewumamibekega_sigaxazelukipij.pdf
    • http://devatacircle.org/uploads/1/3/0/3/130313440/setizonegekuw.pdf
    • http://coachstaveshky.com/uploads/1/3/0/6/130620916/sitimisa.pdf
    • http://autumnland.net/uploads/1/3/0/5/130550952/bilomi.pdf
    • http://kasil.club/uploads/1/3/0/7/130776514/famebiguwozoj.pdf
    • http://kellydaydreamer.com/uploads/1/3/0/8/130873965/vipuz-zejizaxapuvu-bitesap.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f43.bin
11a7ead263af6228d39cf0f0577f61538aff777bf25ee816b1b4604ccd9eb9f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F43 7388 bytes

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