Malicious PDF — malware analysis report

Static analysis result for SHA-256 915dd33b0beb69dc…

MALICIOUS

PDF

27.1 KB Created: 2020-05-28 10:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 324719e0bef2864018e3d216fd407aab SHA-1: 1d160fed59f21e8f941ebdd0945b9f96d4be79b5 SHA-256: 915dd33b0beb69dce477f1cfee52e80d5233850023a2b090ae3abe2a40b25af2
94 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious and contains a large number of external links, indicative of a link farm or SEO spamming technique. The primary purpose appears to be to distribute traffic to numerous unrelated domains, potentially for malicious redirection or to artificially inflate search engine rankings. No scripts were extracted, and the document body contained mostly garbled text and repeated URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://personalstylistsdenver.com/uploads/1/3/0/6/130604366/130604366.html#solid+color+background+image
    • http://dcs-electronics.com/uploads/1/3/0/7/130738789/sakamatojemawez-lenoseregatave-jenix-kikebiz.pdf
    • http://ahrens.studio/uploads/1/3/0/4/130483820/bcd1c85.pdf
    • http://templebodyworks.com/uploads/1/3/0/6/130603710/gomarukubuvot.pdf
    • http://mx.casting4growth.com/uploads/1/3/1/3/131379321/2434749.pdf
    • http://3boyspaintingparties.com/uploads/1/3/0/6/130605080/debiwujirosa-jizobexaruvima.pdf
    • http://kidshelpingparents.com/uploads/1/3/1/6/131636766/puwaku-gogejo-xuxobigojorabo-lapela.pdf
    • http://rosebenaturals.com/uploads/1/3/0/8/130874365/zawasedita_vuluxabapipiluf_jitabonuse_jaweden.pdf
    • http://axiscompanyonline.com/uploads/1/3/0/7/130776607/pavugibafepe.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_off00004377.bin
7c842a3d5c6676e1cf5e6633e8fca21808f5a7376dc95f98c73182c307976135		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4377 8840 bytes

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