Malicious PDF — malware analysis report

Static analysis result for SHA-256 51798794c98ff14e…

MALICIOUS

PDF

47.9 KB Created: 2020-08-06 10:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa1d58e7dd503f51347090840ff28453 SHA-1: f8edac2cdd5b2849d35fb407cce6b5efe66afa0d SHA-256: 51798794c98ff14e4147292e1193b7fb502a4d868c49b984167dd2a1fac7e159
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of external PDF links, indicating a link farm designed to obscure malicious activity. The primary malicious URL identified is https://ttraff.ru/pify?keyword=reading+comprehension+activities+pdf, which likely serves as a gateway to further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=reading+comprehension+activities+pdf
    • http://files.myjesusdream.com/uploads/1/3/0/7/130739227/3375386.pdf
    • http://warelidid.3am.ency-education.com/uploads/1/3/0/7/130776760/nafitem_wufuwixi_vukefape_garoka.pdf
    • http://files.tuskiescurbside.com/uploads/1/3/1/6/131606965/6016394557d2.pdf
    • http://files.mnbtradingpost.com/uploads/1/3/1/3/131378932/papubivuri.pdf
    • http://files.mountaincelebrations.co.uk/uploads/1/3/0/8/130813378/6210473.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0969/files/hollywood_forever_cemetery_map.pdf
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/xugubux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xopiforosolakalaxelavur.pdf
    • https://cdn.shopify.com/s/files/1/0430/3421/4561/files/53961947850.pdf
    • https://cdn.shopify.com/s/files/1/0428/3236/3676/files/89264860513.pdf
    • https://cdn.shopify.com/s/files/1/0437/4318/2999/files/web_development_in_php_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/5080/3099/files/97099035862.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48054684450.pdf
    • https://cdn.shopify.com/s/files/1/0431/2399/8874/files/65055675695.pdf
    • https://cdn.shopify.com/s/files/1/0428/8996/9820/files/ibps_rrb_admit_card_download_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1261535930.pdf
    • https://cdn.shopify.com/s/files/1/0433/4678/8502/files/52495912373.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_off00007c0f.bin
69ab9b497ddc551e0793801888354935487d1af9e12bf639d997cdbe3a1e7a3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C0F 5604 bytes
font_01_sfnt_off00008f07.bin
028e3e6b37e237b92cf25b7a4235f95f26e1609d52a270332c521a35c50d4494		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F07 10252 bytes

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