Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a2b5667c1ff5c9…

MALICIOUS

PDF

37.4 KB Created: 2020-03-15 03:11:38 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f9d50cc1946cdf38f9ca5964c276ba86 SHA-1: d1e8d59153d6578dd7654da605b65c23d8dc92e6 SHA-256: a4a2b5667c1ff5c9c5a17458f1c27385e302ecb45791697ffaf2812be49391b3
94 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files. The primary URL, 'http://a1991107xstreamtravel.xsideas.com/uploads/1/3/0/9/130969480/130969480.html#hotmail+emails+to+hard+drive', suggests a lure related to email or data storage. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm, a common tactic for distributing malware or conducting phishing campaigns.

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://a1991107xstreamtravel.xsideas.com/uploads/1/3/0/9/130969480/130969480.html#hotmail+emails+to+hard+drive
    • http://www.walternicolau.net/uploads/1/3/0/4/130476850/7192380.pdf
    • http://themammareturns.com/uploads/1/3/0/6/130621383/855427.pdf
    • http://beeldschermverhuur.eu/uploads/1/3/0/2/130289772/99d8a1862a.pdf
    • http://www.southwestoregonwood.com/uploads/1/3/0/8/130874526/bbfcff93cd424e.pdf
    • http://www.barrybbritton.com/uploads/1/3/0/6/130605332/9420241.pdf
    • http://cammodelfetish.com/uploads/1/3/0/7/130740524/9051fc8.pdf
    • http://808enterprises.net/uploads/1/3/0/2/130287500/jurojerolubape-losile-rusejelib-kaxajepug.pdf
    • http://premedicated.net/uploads/1/3/0/4/130436054/2d0c67441f994a3.pdf
    • http://anvilmediagroup.com/uploads/1/3/0/7/130776105/1574545.pdf
    • http://www.jeffandjohnnae.com/uploads/1/3/0/5/130545097/8da3fc0bb0b9eb.pdf
    • http://www.pearcervandauto.com/uploads/1/3/0/6/130621460/gumufudowejiko_mozux.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_off000069bb.bin
19be9e29cd2d4d0cceab57b8bb95a33124d9f6b96efe72db747d15ccea3a060c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69BB 8052 bytes

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