Malicious PDF — malware analysis report

Static analysis result for SHA-256 e80823072898417b…

MALICIOUS

PDF

41.9 KB Created: 2020-08-14 06:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe9007cb8f4f3b075f91791e43342e85 SHA-1: 9d6b3e31aed834014df47f4eb584399e5d0c0fb0 SHA-256: e80823072898417b4f4e39ef0c8b44ee1ddf8c013ac03e4766f7be8e0b780eaf
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDFs, indicating a link farm designed for SEO manipulation. One prominent link, 'https://ttraff.cc/pify?keyword=maths+grade+10+textbook+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Maths grade 10 textbook pdf', suggesting a lure to disguise the malicious intent. The primary goal appears to be redirecting users to malicious infrastructure.

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=maths+grade+10+textbook+pdf
    • http://files.mariannecenko.com/uploads/1/3/1/6/131636642/b3ba51cf.pdf
    • http://nekefu.ofpastoralcharge.com/uploads/1/3/1/6/131606289/142137d7203f8e.pdf
    • http://zasif.tessamanningyoga.com/uploads/1/3/1/0/131070722/regapefituka_nukujaxunagifip_wirijev.pdf
    • http://files.vk3sn.net/uploads/1/3/1/8/131871894/d40f274a4b81b4.pdf
    • https://cdn.shopify.com/s/files/1/0432/1699/4466/files/zodotezizovidizodogebu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7103/6823/files/functional_skills_english_level_2_past_papers.pdf
    • https://cdn.shopify.com/s/files/1/0427/6686/0455/files/java_programming_tutorial_point.pdf
    • https://cdn.shopify.com/s/files/1/0440/7322/2294/files/roxozepo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0861/files/34225888633.pdf
    • https://cdn.shopify.com/s/files/1/0429/0809/0535/files/84998071.pdf
    • https://cdn.shopify.com/s/files/1/0430/5554/6517/files/86707380388.pdf
    • https://cdn.shopify.com/s/files/1/0437/1172/5723/files/coreldraw_for_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/1325/0972/files/sexufabivozategar.pdf
    • https://cdn.shopify.com/s/files/1/0430/0757/4179/files/23785702496.pdf
    • https://cdn.shopify.com/s/files/1/0435/1537/9880/files/17036433495.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_off000064f7.bin
3e892104df8a76e1c837dce35b68a99d4e927abba2b8eab6b5d3e4775b5664a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F7 5740 bytes
font_01_sfnt_off0000788a.bin
be8f33087e8c72ebe9b07196fd75633fceae807af605a5a4211c2846d78be492		 pdf-font-stream PDF embedded font (sfnt) at offset 0x788A 10092 bytes

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