Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ebafcadddcc0235…

MALICIOUS

PDF

41.4 KB Created: 2020-04-21 08:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 62bd3333ba250588d1dda94056143e69 SHA-1: 44022dcdd5a8177dd7fcfd14caf8972b3ca99a61 SHA-256: 6ebafcadddcc023541e816e31279f377ed5671be42c24da96a25a119d2503a1f
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on similar domains. This suggests a link farm or SEO spam campaign. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://juicyscoopobsessed.com/uploads/1/3/0/9/130969904/130969904.html#c+stringbuilder+appendformat+newline
    • http://leiyamahoneymassageandbodywork.com/uploads/1/3/1/6/131637333/9609637.pdf
    • http://canyonranchsporthorses.com/uploads/1/3/0/7/130775822/31f958e.pdf
    • http://synergymedtrans.com/uploads/1/3/1/4/131407241/bemen_jivafegemadoj_mopilufudot_pezetotoniwakev.pdf
    • http://farkindaliklayasam.org/uploads/1/3/1/4/131408117/913315.pdf
    • http://cfautobroker.com/uploads/1/3/0/5/130543212/4280802.pdf
    • http://twistofmodern.net/uploads/1/3/0/4/130483679/fipogelelener_gudadajutejifi_miruludoseg.pdf
    • http://301businesscenter.com/uploads/1/3/0/5/130590550/nixusuxumenaf.pdf
    • http://cockburnarchitecture.com/uploads/1/3/0/6/130621301/4069193.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_off00007912.bin
088c12175c3d6a5e7199e253cef2c863601ac642eee14694fba0c1e0c7ab81e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7912 8500 bytes

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