Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb56a21d26eef4bc…

MALICIOUS

PDF

41.6 KB Created: 2020-04-20 03:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fbfac718b7997be44a832d9487a1877b SHA-1: 6be9e7a6a639c59bc37b42ca58b4bb4bd0cfe816 SHA-256: bb56a21d26eef4bc714640dbda969163707f04b686587a0283b2719e6de26431
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or redirection mechanism. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the structure and embedded URLs point towards a content-luring or SEO-based malicious distribution strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://thefritzexperience.com/uploads/1/3/0/7/130776035/130776035.html#new+albums+2018+video
    • http://ilsvg.com/uploads/1/3/0/5/130589267/9515704.pdf
    • http://bracebridgerepaircentre.com/uploads/1/3/0/6/130620353/pilako.pdf
    • http://jimbosbbq.com/uploads/1/3/1/4/131453018/b348013.pdf
    • http://mservices832.com/uploads/1/3/1/3/131379015/livutopulepemojesom.pdf
    • http://catherinebement.com/uploads/1/3/0/8/130814576/xufidetilativo_domod_govidisag.pdf
    • http://taptree.com/uploads/1/3/1/4/131406436/tupolosutizug-xaravekod.pdf
    • http://catholicstogetherinleicester.com/uploads/1/3/0/3/130324044/dotibalizonije-lidiwaxamerit-mugunu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a49.bin
c504ecb1948c4da172745007824170f2cc730608a28fad84f79304199bba719e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A49 8972 bytes
font_01_sfnt_off00007c40.bin
2e0d6281891bd9bd2719a61e260300a7d87bd62bfd1c80e29c658e39d626dd30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C40 2628 bytes
font_02_sfnt_off00008589.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8589 16036 bytes

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