Malicious PDF — malware analysis report

Static analysis result for SHA-256 255e087305697bbb…

MALICIOUS

PDF

41.5 KB Created: 2020-08-05 07:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6deaa78e30456ad336afa780fa59bf6 SHA-1: e0707ca3601f62159175acc383d6cf02fea1833a SHA-256: 255e087305697bbb19792be89a46515bc936048fa8e10c0b0aaad0d9608bf83b
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary malicious redirector URL identified. The document body, though heavily obfuscated, contains the same redirector URL and appears to be a lure for a 'female body language book pdf'. The presence of numerous benign-looking Shopify links suggests an attempt to camouflage the malicious redirector within a larger link farm. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=female+body+language+book+pdf
    • http://files.caseyandjess.com/uploads/1/3/0/7/130776755/mipapaki.pdf
    • http://files.centerschoolpto.com/uploads/1/3/1/8/131856042/d11b9.pdf
    • http://files.russeldmcleanbooks.com/uploads/1/3/1/3/131397981/4a0e6e1b0.pdf
    • https://cdn.shopify.com/s/files/1/0431/1613/4562/files/zoruzaperovuzamobeg.pdf
    • https://cdn.shopify.com/s/files/1/0432/7640/2854/files/xuvowapetagoruwatefo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9586/files/18977319765.pdf
    • https://cdn.shopify.com/s/files/1/0433/6621/9941/files/liwivofewulekitikopolisel.pdf
    • https://cdn.shopify.com/s/files/1/0437/6772/6232/files/9945325406.pdf
    • https://cdn.shopify.com/s/files/1/0437/3151/7605/files/21196818556.pdf
    • https://cdn.shopify.com/s/files/1/0434/3486/8897/files/kulogugeluvipu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5409/6806/files/vomimitikijo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6385/2712/files/43136229329.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87967576867.pdf
    • https://cdn.shopify.com/s/files/1/0434/1887/8114/files/classical_mechanics_taylor_solutions_manual_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/1057/1940/files/22115563571.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_off00006498.bin
4475330f051c471d94600f9388a00144bafc0c7252ffc7bf222e47bf99a9295c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6498 5348 bytes
font_01_sfnt_off000076c8.bin
17ad361e253f031e0361811719eb52bec031b97fdffdd2efc7c973da4e84d572		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76C8 10148 bytes

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