Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd8e0c10ced6cb2…

MALICIOUS

PDF

34.0 KB Created: 2020-04-16 05:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fa285ce06013c2992382d26832cf3897 SHA-1: c87b373e23b3a0f49ef98b4947b04ef18f17e01f SHA-256: 4fd8e0c10ced6cb29cf6817db65f968ff1953af0b6e8d426fb62a8146f8bc8f9
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 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 text is heavily obfuscated but appears to contain some of these URLs, suggesting the primary purpose is to redirect users to these external resources. No scripts were extracted from this sample.

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://heritagebakedgoods.com/uploads/1/3/0/5/130543588/130543588.html#auld+triangle+lyrics+pdf
    • http://brunostippe.com/uploads/1/3/0/5/130544703/peluditoserotalejox.pdf
    • http://fantasyfootballdraftrankings.com/uploads/1/3/0/5/130588550/1201934.pdf
    • http://otbg-togo.com/uploads/1/3/0/4/130476298/sevanulujibofin.pdf
    • http://badcathalloween.com/uploads/1/3/0/2/130289421/mebat.pdf
    • http://3eandudesigns.com/uploads/1/3/1/4/131438617/gefuxiriz.pdf
    • http://fentonrobotics5114.com/uploads/1/3/0/7/130738614/xusapugajibusat.pdf
    • http://marthasdilemma.com/uploads/1/3/0/4/130436085/ponotirera.pdf
    • http://digital-human.org/uploads/1/3/1/4/131407300/nubodetimejojuruzame.pdf
    • http://anthonymannionphotography.com/uploads/1/3/1/4/131437093/tifone_kuvuw_batade_moziwi.pdf
    • http://alessanp1.com/uploads/1/3/0/7/130739809/28387f17d0.pdf
    • http://successawaitsteam.com/uploads/1/3/0/7/130740195/9822965.pdf
    • http://rde-enterprise.com/uploads/1/3/0/7/130740257/zanomiwulude_guxas_madikugarob_juwado.pdf
    • http://poppymcpherson.com/uploads/1/3/0/8/130815303/5110288.pdf
    • http://ancientartstone.net/uploads/1/3/1/3/131384115/610443.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_off00005e4c.bin
a8498772c4788d0fb105675625f0b5a7c8bf50e2a2f35bcacae42cd6d5275847		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E4C 7736 bytes

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