Malicious PDF — malware analysis report

Static analysis result for SHA-256 7889c6e0d8aa037e…

MALICIOUS

PDF

33.3 KB Created: 2020-04-17 06:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 52776c6b015baf0cd810a0ad78c00a9c SHA-1: e572f2d6e6b57f9a99cb1353963ace82696fe3c4 SHA-256: 7889c6e0d8aa037e772f8f0788955d43c9f059401827c3d20e5352c127c1b42a
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the 'PDF_SEO_LINK_FARM' heuristic. The document body, though heavily obfuscated, also contains URLs that appear to be part of this link farm. This suggests the primary purpose is to direct users to a network of websites, likely for SEO manipulation or to serve malicious content. No scripts were extracted, but the presence of numerous external links points to a malicious intent to redirect users.

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://sixty8design.com/uploads/1/3/0/4/130476691/130476691.html#android+studio+documentation+for+android+sdk
    • http://theportraitking.com/uploads/1/3/0/9/130968960/linanopixaxawoloxem.pdf
    • http://jillskupinburkholder.com/uploads/1/3/0/6/130604102/kinusugakolalu.pdf
    • http://tjmarkets.ca/uploads/1/3/0/7/130776850/larinovevowajuw.pdf
    • http://haitianfoundationforchange.com/uploads/1/3/0/8/130873856/gazimelelosen.pdf
    • http://www.onlymusic.com.tw/uploads/1/3/0/7/130740169/ximowuxutaz.pdf
    • http://elkcreekspreservationsociety.org/uploads/1/3/0/9/130969118/rezodokerafekawumomu.pdf
    • http://andrewbarenconsulting.com/uploads/1/3/0/6/130639856/nawuvapufe.pdf
    • http://customequestrianproducts.com/uploads/1/3/1/3/131398429/4471d2.pdf
    • http://firstchristianyouth.com/uploads/1/3/1/3/131380759/01d0efb.pdf
    • http://erikbucoy.com/uploads/1/3/0/2/130272081/88d36a3.pdf
    • http://bdrobohackerz.org/uploads/1/3/0/9/130969627/6245766.pdf
    • http://poweredbytheblueoval.com/uploads/1/3/0/6/130621864/6305410.pdf
    • http://smartedgenetwork.com/uploads/1/3/0/8/130814246/vuwabomafigi.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_off00005aa8.bin
b3aba15f2bdf2161245bdec5a16fd68f7ae45e5e215d6d83b678aa8aeb3c1d98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA8 7724 bytes

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