Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b50d643e7bf6c1…

MALICIOUS

PDF

34.7 KB Created: 2020-09-01 07:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3a4ce1b1e8901e5b60bd29cef2bb294 SHA-1: 9972fb741f40007af6eeb0b9b87ff392fdf5c5bf SHA-256: c8b50d643e7bf6c1cf149613e52db66f6e61f8b7a6dccfa36efa46da771a3daf
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Nitro pro pdf to word online', suggesting a lure to trick users into clicking the malicious link. The presence of numerous external PDF links further supports a link farm strategy, likely for SEO poisoning or to obscure the final malicious destination.

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.cc/wix?keyword=nitro+pro+pdf+to+word+online
    • https://static.usrfiles.com/ugd/74a852_1a33268966bf45d2b970b3b5ef9a7d9f.pdf
    • https://static.usrfiles.com/ugd/b8c837_e78df294ef654ab2b940ce7421fba450.pdf
    • https://static.usrfiles.com/ugd/b8c837_74beb7bea6ba4e3fb1485657d6d6f66d.pdf
    • https://static.usrfiles.com/ugd/ce5d00_1fa562331c4145e4b7da71add6f09e8d.pdf
    • https://static.usrfiles.com/ugd/8ab72e_7206f165645940dbaf26c11faf416055.pdf
    • https://cdn.shopify.com/s/files/1/0431/1236/6231/files/bemivoba.pdf
    • https://cdn.shopify.com/s/files/1/0437/5874/7800/files/heroclix_dial_maker.pdf
    • https://cdn.shopify.com/s/files/1/0428/6706/4998/files/92639545777.pdf
    • https://cdn.shopify.com/s/files/1/0448/2406/8258/files/medidas_de_tornillos_para_madera.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b16d1d4224f41dd92eab41919879f9f.pdf
    • https://static.usrfiles.com/ugd/8b9728_9416028f5171460bb04a60590eab674e.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a7d.bin
bc5db1976eb0c6b41da011c6cd842362766c13a68feecb5728659c64a0b6ef09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A7D 4708 bytes
font_01_sfnt_off00005aad.bin
901aec859fed051d2e56648373af83f76f2ef48f7ea1e9ee06f15ed5f42d6e29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AAD 10384 bytes

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