Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8067ee93e63c2d8…

MALICIOUS

PDF

45.6 KB Created: 2020-07-30 10:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 955f520c05f401c7a789f6da0f3d9b1d SHA-1: b22786ce8938ee6ad56746c604033f6bc742ac20 SHA-256: a8067ee93e63c2d8a2ffcf7cacef2140b9810c5d1c326c35d94b65582f4de0db
120 Risk Score

Malware Insights

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

The PDF file contains numerous links, masquerading as IELTS paraphrasing exercises, that redirect to a malicious URL. The primary heuristic indicates a malicious redirector link, and the document body, though heavily obfuscated, suggests a lure related to IELTS exercises. The file's structure and embedded links strongly suggest a phishing or redirection attack.

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=ielts+paraphrasing+exercises+pdf
    • http://files.clubnahakaratedo.com/uploads/1/3/2/8/132814680/0ecf22e.pdf
    • http://files.the-beaver-house.com/uploads/1/3/1/4/131454316/2622033563744.pdf
    • http://files.demelzafox.com/uploads/1/3/1/4/131437878/gipuxefafitif.pdf
    • https://cdn.shopify.com/s/files/1/0434/2172/8930/files/9203856320.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lobusine.pdf
    • https://cdn.shopify.com/s/files/1/0429/6533/6217/files/2795404870.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32852202686.pdf
    • https://cdn.shopify.com/s/files/1/0430/3188/8021/files/rokofekonowutoxiwil.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0078/files/41988539533.pdf
    • https://cdn.shopify.com/s/files/1/0430/0891/7657/files/miwetubojojerewi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1498/7674/files/6029994622.pdf
    • https://cdn.shopify.com/s/files/1/0437/3712/0933/files/domamiwovewobamebajil.pdf
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/93001326763.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/82383973602.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/93394009727.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_off00007551.bin
b1bc948a912be0215b74eda3809f46e347f20c2e03c256e122a8e9afbbda84eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7551 5100 bytes
font_01_sfnt_off0000869e.bin
091357934e1973e2be5f4fb914d39d592cc1848a8db353760f0faf8bffb5c143		 pdf-font-stream PDF embedded font (sfnt) at offset 0x869E 10204 bytes

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