Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f18429f49cacbc…

MALICIOUS

PDF

38.6 KB Created: 2020-08-30 07:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdcb6846daee55176b109f79d8f75f8c SHA-1: 257a751bd65468c97e58831d7fd53b941d096f82 SHA-256: 54f18429f49cacbc46148b5cc82560a1ecac0d680572a9f5aee0b4995ac8dd63
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains the same suspicious URL. This indicates a link farm strategy, likely intended to lure users to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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=michael+h+hart+the+100
    • https://static.usrfiles.com/ugd/6c032c_899d118055e5431491e8857a44d234b3.pdf
    • https://static.usrfiles.com/ugd/bd5c68_788d729ee65f4cc5bace5a89fb0138d5.pdf
    • https://static.usrfiles.com/ugd/b8c837_ebe5f5248af946c5b1cf4e1835eef8ce.pdf
    • https://static.usrfiles.com/ugd/69695d_46b68a34c2d1472eadf70a4a243626f6.pdf
    • https://cdn.shopify.com/s/files/1/0440/5392/1957/files/86132009150.pdf
    • https://cdn.shopify.com/s/files/1/0431/0122/5114/files/old_telephone_ringtone_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/2328/3862/files/15592257890.pdf
    • https://cdn.shopify.com/s/files/1/0433/6336/9125/files/nagoxifofipurubidexinovux.pdf
    • https://cdn.shopify.com/s/files/1/0438/1035/7405/files/bapazigavuwefu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/6356651101.pdf
    • https://cdn.shopify.com/s/files/1/0436/6021/4425/files/dewamujudeno.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_off00005bc5.bin
b7a03835514c319c92f7791dbef3cb208e36f605cc98784239c16854f15fe6d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC5 4908 bytes
font_01_sfnt_off00006c6a.bin
e207a162154768dbcb1d5da122048b74310559e67755e1996d622df966968ab2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6A 9840 bytes

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