Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b7300b6b50df87…

MALICIOUS

PDF

68.9 KB Created: 2020-07-30 16:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f16500d24f0129f7796d9d80afab37ba SHA-1: e03af299faa92fd4b1f201df718273e6bf0dec1b SHA-256: c7b7300b6b50df8753edd62bcab43090823bf5f28279808b49ee61d2a647e960
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector pointing to 'ttraff.com'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate a malicious intent to redirect users to potentially harmful sites. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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/pify?keyword=cricket+rules+pdf+2020
    • http://files.bcm-nl-incidents.eu/uploads/1/3/1/4/131438308/3909781.pdf
    • http://files.rhinoultimate.com/uploads/1/3/1/3/131380292/8292001.pdf
    • http://files.mayranavarroart.com/uploads/1/3/1/4/131438203/nozadedubanuxe-topasotizisum-vizusosomurar.pdf
    • http://files.nod-production.de/uploads/1/3/0/7/130776118/3864674.pdf
    • https://cdn.shopify.com/s/files/1/0437/3485/9941/files/panelinamegujubawun.pdf
    • https://cdn.shopify.com/s/files/1/0436/2308/8290/files/sejejusemovikote.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/jewakoxogomirejudum.pdf
    • https://cdn.shopify.com/s/files/1/0434/5420/2018/files/pugovuwa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/falanit.pdf
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/39468689894.pdf
    • https://cdn.shopify.com/s/files/1/0438/8824/6936/files/84030571744.pdf
    • https://cdn.shopify.com/s/files/1/0434/6124/7138/files/67359385212.pdf
    • https://cdn.shopify.com/s/files/1/0431/7075/8820/files/89159474801.pdf
    • https://cdn.shopify.com/s/files/1/0428/0716/5095/files/34358524324.pdf
    • https://cdn.shopify.com/s/files/1/0432/6018/2692/files/12569869706.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/tevatorivibug.pdf
    • https://cdn.shopify.com/s/files/1/0437/1359/3499/files/43469898180.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_off0000d2fd.bin
fbb5347165e6813e454aade503ed55b03021c08dd618564f5e5d20dd1bb39240		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FD 4964 bytes
font_01_sfnt_off0000e3fc.bin
57b6925465ca46cf911c7cf7aa43d7689f930e2e6238ccf2ba77330099ea6fc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FC 9992 bytes

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