Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fcf21c2cafed909…

MALICIOUS

PDF

53.1 KB Created: 2020-09-02 21:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d832c1ebe91e574c0543cc53989fcce2 SHA-1: 3d4d1dbed6bdf57441ad7cc7b10a82ec611bd77a SHA-256: 8fcf21c2cafed909c36c17804b842d97f6ee6a2a95f03dcdd9d92fa30cbfd683
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a video song and the redirector URL. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content broadly. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=age+age+chahat+chali+video+song
    • https://cdn.shopify.com/s/files/1/0437/1903/2987/files/oxford_dictionary_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/86893507406.pdf
    • https://cdn.shopify.com/s/files/1/0437/6389/2375/files/base_de_datos_access_ejemplos_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0434/6249/2324/files/29288950224.pdf
    • https://cdn.shopify.com/s/files/1/0438/5875/5749/files/social_development_in_adolescence_psychology.pdf
    • https://static.usrfiles.com/ugd/04c368_d82e2e72c0f34d328061058504f8ef8b.pdf
    • https://static.usrfiles.com/ugd/cfbfd2_00b8a7d52a0b4097a1e8a375d283f9d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b3d2e4acaca41d0aa66ff906e5fabe5.pdf
    • https://static.usrfiles.com/ugd/01e791_70ef722c6aa64bb5ae2a2b034a77311b.pdf
    • https://cdn.shopify.com/s/files/1/0432/9380/2646/files/bacterial_cell_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0431/4949/2384/files/xenuzawusipadidobagakut.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005042.bin
fd7fc525511244a9fbede500d5616c605cdfc104e122c961c3aa0d0be2da8dd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5042 5156 bytes
font_01_sfnt_off000061d2.bin
374e1bc11049e2750aa53ff29b446c0e843747e6ee03840a29de6d159c99b266		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D2 2316 bytes
font_02_sfnt_off00006bb9.bin
b0f8cc6c420670f92669378dd56a6fe91a0894f2bd3834343a5d4283216df5c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB9 4420 bytes
font_03_sfnt_off00007a08.bin
d3cada6334a4781b04ab3ec651bf02b89322fe53ca0a00a82b176d834f9a1673		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A08 13248 bytes
font_04_sfnt_off0000a490.bin
3e66ce8c90719045bf8f6c8d5f716325bbce29c89c8399c9e71e7e90b46a9b16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA490 16028 bytes
font_05_sfnt_off0000b915.bin
4c4a0ff5f7807da45850c2ba3d6abd5c692330663aca21aeec19e551b3865336		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB915 3328 bytes

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