Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cddb29bf5c74cbe…

MALICIOUS

PDF

38.5 KB Created: 2020-04-07 09:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 107a60826618957833bb02af029ab941 SHA-1: aa020c1092471810b3029be206f4cf235a5c5eaf SHA-256: 1cddb29bf5c74cbe698049a8360545c6c71e5a0c34db10673dc5dd41522ef682
94 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains a title related to child development and numerous URLs pointing to other PDF files on various domains, suggesting a link farm or redirection scheme. No scripts were extracted, but the sheer volume of external links is highly suspicious.

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://prolystings.com/uploads/1/3/1/3/131383515/131383515.html#what+are+the+developmental+stages+of+child+in+art
    • http://pcslogic.com/uploads/1/3/0/5/130590298/3841711.pdf
    • http://ninaschjeide.net/uploads/1/3/0/8/130813079/4788432.pdf
    • http://reef2rangestouringaccessories.com/uploads/1/3/0/3/130323555/xilebolisepom_tijevug.pdf
    • http://landclearinghoover.com/uploads/1/3/0/3/130313057/kudulunar.pdf
    • http://westwoodunidos.com/uploads/1/3/0/7/130739904/e92d951e5f4a.pdf
    • http://equinetale.com/uploads/1/3/0/9/130969462/zigozowig.pdf
    • http://graylynnfunding.com/uploads/1/3/0/8/130813827/lijesuxoru-fawagemevowimep-wotikaxun-xodijurew.pdf
    • http://thejourneyfoundation.net/uploads/1/3/0/5/130589348/6887889.pdf
    • http://dssmallenginerepair.com/uploads/1/3/0/8/130813931/5521753257d.pdf
    • http://lestateliving.com/uploads/1/3/0/7/130776776/xugud_bibevisirun_xakaser_tozegalusiz.pdf
    • http://gannontaxes.com/uploads/1/3/0/5/130590481/zopeneruva.pdf
    • http://livestockadvertisingnetwork.biz/uploads/1/3/0/3/130379118/3302496.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_off00006f42.bin
0b5256988f59b8566a353d43f85e337bc8b6ae470784fa850b744d95e21aaa77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F42 7608 bytes

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