Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40d2b8af834306b…

MALICIOUS

PDF

41.1 KB Created: 2020-08-02 22:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88ccc58ea4b850712a0d921c0d7e9ba2 SHA-1: d240b19c691fd878585529416702a7a7f6ed3945 SHA-256: d40d2b8af834306bd72b372626e1890957703a9c3b09b6fe2421100420f146a9
120 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a redirector URL, indicating a malicious intent to direct users to external sites. The document body, though heavily corrupted, contains text suggesting it is a 'biology book answers' lure, which aligns with the heuristic findings of a PDF link farm and malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=biology+book+answers.

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.ru/pify?keyword=biology+book+answers
    • http://files.bastionaudio.co.uk/uploads/1/3/1/4/131406885/dakarusesave.pdf
    • http://files.jenniferdsandquist.com/uploads/1/3/2/6/132680998/a115cae8197.pdf
    • http://files.bluefinmiddletonma.com/uploads/1/3/1/1/131163879/faxotod_medito.pdf
    • http://files.hellogorgeousre.com/uploads/1/3/0/7/130775265/9047351.pdf
    • https://cdn.shopify.com/s/files/1/0429/3938/3971/files/pokemon_silver_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/5704/5913/files/desafujidusijeto.pdf
    • https://cdn.shopify.com/s/files/1/0435/8298/0259/files/2397734643.pdf
    • https://cdn.shopify.com/s/files/1/0432/6303/3502/files/17658993102.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/voxetevew.pdf
    • https://cdn.shopify.com/s/files/1/0432/9875/0629/files/46928615154.pdf
    • https://cdn.shopify.com/s/files/1/0430/7533/8389/files/dilubevabivopu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3134/7868/files/45110755099.pdf
    • https://cdn.shopify.com/s/files/1/0430/8513/6021/files/tizofufadul.pdf
    • https://cdn.shopify.com/s/files/1/0430/0298/6659/files/fafugeremesejapamasim.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5400/files/91992205768.pdf
    • https://cdn.shopify.com/s/files/1/0429/9581/0455/files/47048415903.pdf
    • https://cdn.shopify.com/s/files/1/0431/5181/8903/files/56810007642.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_off00005802.bin
11a01bcf270e3f2a6f999229e27ef4646b146103d1e555b5d557e779095062f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5802 5300 bytes
font_01_sfnt_off00006a38.bin
68ebb62120f88f71dab9ef98bb6c1f40929e48c0ddbe85fabf36c55b41be9e22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A38 13596 bytes

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