Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cde51dbd33f3a7b…

MALICIOUS

PDF

46.8 KB Created: 2020-08-20 06:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9553c8de24031bb1d8de91bc155d7bd0 SHA-1: cf54931ea2647bae8260b469d3de8fb60cc873fe SHA-256: 3cde51dbd33f3a7b2b9b9c33e64c9bc6ffe04f6cfdf8b3c7851edd15c4b06b08
120 Risk Score

Malware Insights

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

The PDF contains a link farm designed to lure users to a malicious redirector. The primary malicious URL is https://ttraff.ru/pify?keyword=intelligent+business+intermediate+coursebook+answer+key+pdf, which is disguised as a coursebook answer key. The document body and embedded artifacts are heavily obfuscated, but the heuristic firings clearly indicate malicious redirection. No scripts were extracted from this sample.

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=intelligent+business+intermediate+coursebook+answer+key+pdf
    • http://files.femaleilluminati.com/uploads/1/3/0/7/130775484/vilididado-wixir-mapedeza.pdf
    • http://files.aceearlyyears.com/uploads/1/3/0/7/130775001/rorokojirik_xuxijilogira_xazawu.pdf
    • http://files.turkeycreekretrievers.com/uploads/1/3/1/3/131381540/jumopezosed.pdf
    • http://files.tccschattanooga.com/uploads/1/3/2/8/132815175/4290213.pdf
    • https://cdn.shopify.com/s/files/1/0434/1016/1829/files/35013925049.pdf
    • https://cdn.shopify.com/s/files/1/0433/3145/3081/files/37107129376.pdf
    • https://cdn.shopify.com/s/files/1/0432/6375/4404/files/74851054257.pdf
    • https://cdn.shopify.com/s/files/1/0430/6246/0577/files/75651019434.pdf
    • https://cdn.shopify.com/s/files/1/0436/9340/8409/files/fikofebokimabemag.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/58437458734.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7348/files/navekidoxasokukegarif.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/zevudilotan.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/84562035286.pdf
    • https://cdn.shopify.com/s/files/1/0433/5245/7369/files/abraham_j._twerski_books.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/69706414948.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006717.bin
9b7adc16f091eab9a772672ebb15afbd8737edb2def8a18470290a5869925928		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6717 5692 bytes
font_01_sfnt_off00007a69.bin
afefe775c0acb15c3692bd04935d9f2ef7e1ce4a34b98a29098f392f9810b7f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A69 10344 bytes
font_02_sfnt_off00009db9.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DB9 4324 bytes

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