Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be918527a3de959…

MALICIOUS

PDF

49.1 KB Created: 2020-08-31 03:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a16e160d2320d6e054860b41fab7634 SHA-1: 17c0aff6d798820ca8fac589cf1193e37c0f2ffd SHA-256: 5be918527a3de959f119af274ff1ca89db057f9fc70b079c9812aa0a1e66074a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the same URL and a list of other URLs, suggesting a link farm or SEO poisoning attempt to drive traffic. The ML classifier also strongly indicated maliciousness.

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.me/wix?keyword=letras+del+abecedario+bonitas+para+imprimir+individuales
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/defcb2_f9fb3730fb404acfb6e23cc5ae975cc3.pdf
    • https://static.usrfiles.com/ugd/b8c837_03b346ecdfe244d6a691f349a32ad0e0.pdf
    • https://static.usrfiles.com/ugd/5438e3_5a585d5af2ab43ab8ed9e3c19ea2b3a1.pdf
    • https://static.usrfiles.com/ugd/353d00_63de1171a57441aba90d300cf2026186.pdf
    • https://static.usrfiles.com/ugd/f459ea_b8d1362037df4071ae09c2239ad3c02c.pdf
    • https://static.usrfiles.com/ugd/b8c837_25286c4c53824c33bd323f6e63ff0e53.pdf
    • https://static.usrfiles.com/ugd/b8c837_169c9eff585f45d593665a06615ddecc.pdf
    • https://static.usrfiles.com/ugd/60933b_1098f19fb0bc413f8cba9326788188d3.pdf
    • https://static.usrfiles.com/ugd/7f16bd_70eac5f651654654b02ccf18b8e26e3b.pdf
    • https://static.usrfiles.com/ugd/cc14e4_b1ba50eb79bd42fa93bd4af1d64edb5e.pdf
    • https://static.usrfiles.com/ugd/20d83a_4e8a3f1b2973427c8a074cc88cb512b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_cee671552ef741289eafb298edd3806e.pdf
    • https://static.usrfiles.com/ugd/078c79_89d2730b9a0b46a486375ea08903a6eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e081f05ea1440baa367ae5b67838ba9.pdf
    • https://static.usrfiles.com/ugd/b3bc21_71e0857dbde74da0803eedf94b3d4226.pdf
    • https://static.usrfiles.com/ugd/f46427_a5a0e20fd3a34946b11f53ef4258ebf0.pdf
    • https://static.usrfiles.com/ugd/f967ac_b94629ab912b4715834eb4b9dc46c908.pdf
    • https://static.usrfiles.com/ugd/dcfb95_3327a924e79d42d4aec0c1655dfde013.pdf
    • https://static.usrfiles.com/ugd/b8c837_fba2452068a84ca7a8008921feeaa2fe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000679d.bin
654bf462cd043ca5cd3c74888b03b0937ed5658693ec0e2b90bd0f9e4da3988f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x679D 5240 bytes
font_01_sfnt_off00007940.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7940 1800 bytes
font_02_sfnt_off000081cd.bin
5394e174bd279e8cb83c39db9fd9efb48e4bdc44018b58d499c5bc08c612226d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81CD 11248 bytes
font_03_sfnt_off0000a690.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA690 4324 bytes

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