Malicious PDF — malware analysis report

Static analysis result for SHA-256 5caf4d6a4c6f7d95…

MALICIOUS

PDF

42.6 KB Created: 2020-08-30 13:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4b37b4ecaf4246c0825f27b65a91a0c SHA-1: 68f9b4863e9eed84d6df17b7e3065fd2de88d011 SHA-256: 5caf4d6a4c6f7d950230ab96e4843ec50cfc8a6ec629e4808d338893731a6a5c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, a technique often used in SEO link farms. One of the primary links directs to a known malicious redirector, indicating a malicious intent to lead the user to harmful content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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 https://ttraff.com/wix?keyword=lincoln+and+guba+naturalistic+inquir
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/affaa6_8b9f3dc852d54363a70e5bb4416629e0.pdf
    • https://static.usrfiles.com/ugd/f0e51d_5d23e8671ee34f3eb4404784cfc8b968.pdf
    • https://static.usrfiles.com/ugd/78c764_5e6a11369a19459cb3493e5981b7dada.pdf
    • https://static.usrfiles.com/ugd/756799_ee743dd69ac9455ea53f672c513d347e.pdf
    • https://static.usrfiles.com/ugd/b8c837_8157230c95704753aa5721fb6637c01b.pdf
    • https://static.usrfiles.com/ugd/3b7182_495cd09a3ca4420694c557dc26b83136.pdf
    • https://static.usrfiles.com/ugd/b8c837_84925f555f054e87bcf7bacf60537fb1.pdf
    • https://static.usrfiles.com/ugd/221f3a_ee639baab36843cfbe4c306a3b7c4581.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7110c20f72341d9a60270351c8b1b8c.pdf
    • https://static.usrfiles.com/ugd/760101_e5d5688c2eb64f55aff343763a68938f.pdf
    • https://static.usrfiles.com/ugd/b8c837_6212f1430b58437d84a577fc1e1c08ef.pdf
    • https://static.usrfiles.com/ugd/122077_bea1990cf8b345c0a635a424bf1d8aca.pdf
    • https://static.usrfiles.com/ugd/b8c837_fbd27196c5c54090987e5dde8e6bc8a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_b97a0e3b72dc47ab8d3b8cce4610559d.pdf
    • https://static.usrfiles.com/ugd/b8c837_dddc3f59f09c4d07bce77264278fd212.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b97.bin
cfbbeea397a4265cf466cc8448b56c19898a677026a85c70a35773538b1ddf1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B97 5076 bytes
font_01_sfnt_off00006cc4.bin
9d126b90e354e53027e30f80cd40409b3916a48c1ecbc013370753181329478b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC4 10244 bytes
font_02_sfnt_off00008f8e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F8E 4324 bytes

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