Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf6777abf410a2b…

MALICIOUS

PDF

37.6 KB Created: 2020-03-28 04:38:37 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3ef848eddc3ac0384dc3dde1f33c456a SHA-1: 21596b3ee762f6c6d0b2f1b3b17627a366244255 SHA-256: 7bf6777abf410a2b9eff1026345613cc534eed349ccb18fb993321cd53c6597e
136 Risk Score

Malware Insights

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

The PDF document contains a lure related to downloading drivers for a Sony Handycam, but the primary function appears to be a link farm directing users to numerous other PDF files hosted on various domains. The heuristic PDF_RANDOM_URL_LINK and PDF_SEO_LINK_FARM indicate that the document is designed to distribute malicious links, likely leading to further malware downloads or phishing attempts. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://sppslibrary.com/uploads/1/3/0/2/130288378/130288378.html#sony+handycam+dcr-sr68e+driver+download
    • http://campingdeberghoeve.com/uploads/1/3/0/6/130639665/vafewu.pdf
    • http://balancedforlifeyogatherapy.com/uploads/1/3/0/9/130969462/vajuvasoterizofosuxa.pdf
    • http://standrewarvada.com/uploads/1/3/0/6/130639307/6941285.pdf
    • http://myezpzpay.com/uploads/1/3/0/7/130775644/6764593.pdf
    • http://iamkennywilson.com/uploads/1/3/0/2/130287296/tedej-nagulo-moxisutuluso.pdf
    • http://coastalalllinesadjustingcompany.com/uploads/1/3/0/7/130776131/d199795d5a133f.pdf
    • http://www.qatar-atc.com/uploads/1/3/0/4/130475909/b06c15485d.pdf
    • http://blackbooktales.com/uploads/1/3/0/3/130323110/kakajarelite.pdf
    • http://empathtoorder.com/uploads/1/3/0/2/130288522/tupusomosavig.pdf
    • http://comportawear.com/uploads/1/3/0/5/130589186/1308237.pdf
    • http://rebeccavandover.com/uploads/1/3/0/7/130776007/xalikovefor.pdf
    • http://www.pghsportsstore.com/uploads/1/3/0/7/130775365/gusupepegud.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_off00006ac8.bin
f90b899a7cd6d08e3fc662704cb265e039145d03beb112d34a53ec739a1ea8ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC8 7796 bytes

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