Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff6f70d9f7d4037…

MALICIOUS

PDF

42.7 KB Created: 2020-06-05 05:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3dde23a9232653353f7806c251b9df5 SHA-1: 7109ab648825b476264bcb395ba313314fd2dd54 SHA-256: cff6f70d9f7d40377c8b74bc1068bf2130a4bb5af6919c2544f4abb203b918be
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains references to URLs and appears to be part of a link farm strategy, likely intended to manipulate search engine results or redirect users to malicious content hosted on these external sites.

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://41z.undesirable.us/uploads/1/3/1/3/131378796/131378796.html#sacred+geometry+symbols+and+meanings
    • http://disrupt.wtf/uploads/1/3/0/8/130813063/zedejipugemoz.pdf
    • http://cove-bd.com/uploads/1/3/0/7/130739330/botopuzuturogu.pdf
    • http://lovethatconversion.com/uploads/1/3/0/6/130604429/846255.pdf
    • http://tandwinteriors.com/uploads/1/3/0/5/130550960/bixegerune.pdf
    • http://abundanthealthandliving.com/uploads/1/3/0/5/130590105/jujaguvulenatis.pdf
    • http://pro4sales.com/uploads/1/3/0/2/130289448/2872574.pdf
    • http://frukosthem.com/uploads/1/3/0/9/130969278/1406548.pdf
    • http://mgmfixit.com/uploads/1/3/1/1/131164229/4311169.pdf
    • http://webdisk.maplewoodcommunitymusic.org/uploads/1/3/0/7/130775257/6408438.pdf
    • http://lpearsondesign.shop/uploads/1/3/0/8/130814584/2957421.pdf
    • http://patapscooverlook.net/uploads/1/3/2/3/132303226/xudadowi_bonogexosilelis.pdf
    • http://arcadiawatercompanycom.com/uploads/1/3/0/5/130550921/nijutomixavewifuxa.pdf
    • http://41z.undesirable.us/uploads/1/3/1/3/131378796/terms.html
    • http://41z.undesirable.us/uploads/1/3/1/3/131378796/dmca.html
    • http://41z.undesirable.us/uploads/1/3/1/3/131378796/policy.html
    • https://dinejazuvix64615744.files.wordpress.com/2020/06/38906359550.pdf
    • https://bomutap.files.wordpress.com/2020/06/fanuwituzujuwodekaw.pdf
    • https://ratesovepur.files.wordpress.com/2020/06/zonudiximutewevodo.pdf
    • https://sotufux.files.wordpress.com/2020/06/11529476566.pdf
    • https://linisusored.files.wordpress.com/2020/06/zunaraledejudomexawasefu.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_off00007a59.bin
4921a21765e6a9827e9740b50ddccda5a4e1ecc10af714d5224dc55aa932de2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A59 10612 bytes