Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cafad7f3b7267c3…

MALICIOUS

PDF

43.6 KB Created: 2020-03-23 03:08:13 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 962ffa9083055499c74d2c66c609caec SHA-1: b174471c2adc0424f327bbf18294219da4762ebb SHA-256: 1cafad7f3b7267c3824b2fe643ec649af510c987f8bc899ac91a814159ca724d
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO manipulation tactic. The primary URL extracted is http://slinkstudio.com/uploads/1/3/0/6/130621180/130621180.html#principle+of+design+pattern+examples. The document body contains garbled text and some of the extracted URLs, reinforcing the link-embedding behavior.

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://slinkstudio.com/uploads/1/3/0/6/130621180/130621180.html#principle+of+design+pattern+examples PDF link annotation
    • http://endviolence.org/uploads/1/3/0/5/130588714/9193292.pdfIn PDF document text
    • http://akroncantonfirewood.com/uploads/1/3/0/7/130775251/josewezufo.pdfIn PDF document text
    • http://www.cobratiger.com/uploads/1/3/0/3/130379105/toviwiferinal_fazorited_nagofuxaz_nanidawakuwage.pdfIn PDF document text
    • http://cengageourhistory.com/uploads/1/3/0/9/130969501/9160487.pdfIn PDF document text
    • http://www.deztinimusic.com/uploads/1/3/0/7/130739159/ribatup.pdfIn PDF document text
    • http://archus.lt/uploads/1/3/0/5/130550973/8cb4b233.pdfIn PDF document text
    • http://preferredlawnservices.net/uploads/1/3/0/5/130550986/6774177.pdfIn PDF document text
    • http://jerseygod.com/uploads/1/3/0/2/130270748/448770.pdfIn PDF document text
    • http://mail.chces.com.hk/uploads/1/3/0/3/130323478/8483b.pdfIn PDF document text
    • http://olcreeksoaps.com/uploads/1/3/0/2/130272424/lumafewo-vogipefusip-jazuvebuva.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000816f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x816F 7764 bytes
SHA-256: c04b9e9a4eee7005182aba83a61d3a5ca67dd5ce6179561004d75d16e9e8a5db

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