Malicious PDF — malware analysis report

Static analysis result for SHA-256 622b87c2f99fefc2…

MALICIOUS

PDF

52.3 KB Created: 2020-04-10 16:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b5f9adc10c8c389c1643688d39cc3ea7 SHA-1: 224fa351202c4bc906a8bfe0fd6dbb16bf2ba4b5 SHA-256: 622b87c2f99fefc27c9dbe3481bb852eb95e97c826202ea14bac5d3d2a87ba54
96 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or drive traffic to malicious sites. The primary URL, http://yellowdaisycourt.com/uploads/1/3/1/1/131163981/131163981.html#real+followers+apk+unlimited+coins+mod, is presented as a lure for 'real followers apk unlimited coins mod'. While no scripts were explicitly extracted, the PDF structure and extensive external linking strongly indicate a malicious intent to redirect users to potentially harmful content or further stages of infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yellowdaisycourt.com/uploads/1/3/1/1/131163981/131163981.html#real+followers+apk+unlimited+coins+mod
    • http://educateoutsidethebox.com/uploads/1/3/0/6/130604044/wafamixokobixe.pdf
    • http://northmissourisprayfoam.com/uploads/1/3/1/4/131453485/biturofa_reperoku.pdf
    • http://biotanks.net/uploads/1/3/0/7/130739544/kugeniderakeki_midipi_zajowojexirewer.pdf
    • http://dgaudin.com/uploads/1/3/0/2/130271072/zujivurazu_fepamofarewaju_toketagosumixa_puresakuzava.pdf
    • http://bellaluxeaesthetics.com/uploads/1/3/0/5/130539458/sumilesakekapojem.pdf
    • http://amazingsongbird.com/uploads/1/3/0/5/130589315/boguref-zikitiduxazeto-bitur.pdf
    • http://csinconsult.com/uploads/1/3/1/4/131454221/fisaduviserare.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f66.bin
264c884903444012c9210611e5af90d0aad87655791f1005c4521c75aa2c0ed8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F66 8368 bytes
font_01_sfnt_off0000af7c.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7C 16036 bytes

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