Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c372c3d973f351…

MALICIOUS

PDF

40.3 KB Created: 2020-09-01 01:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c4245dbe2cffc4c66604178bedba201 SHA-1: b2be4b7bd52752d3aa3a178abe52c98b64d908ef SHA-256: 88c372c3d973f351a92a40b3b499e8c765df1cccd16dd482768f4a857fbacbc8
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to Shopify domains hosting PDF files, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The document body, though partially corrupted, contains text related to 'math worksheets' and the malicious URL, reinforcing the lure.

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.cc/pify?keyword=math+worksheets+double+digit+subtraction+without+regrouping
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/alphabet_printing_practice_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0436/2669/2771/files/dovevapuwemotunurube.pdf
    • https://cdn.shopify.com/s/files/1/0430/1357/0709/files/wobavoxeb.pdf
    • https://cdn.shopify.com/s/files/1/0429/3473/0911/files/64671492263.pdf
    • https://cdn.shopify.com/s/files/1/0437/0523/7657/files/81459477936.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/femafukiwupofupowaxesor.pdf
    • https://cdn.shopify.com/s/files/1/0449/2083/2167/files/advanced_computer_architecture_book_by_rajiv_chopra.pdf
    • https://static.usrfiles.com/ugd/7603ae_db3b446bae47455e80bbabdd589316b5.pdf
    • https://static.usrfiles.com/ugd/516793_4445a9048bd34cccba2859843ef29ad9.pdf
    • https://static.usrfiles.com/ugd/3aca14_2f81489925ee45fa84e82fedcb4b5af4.pdf
    • https://cdn.shopify.com/s/files/1/0432/3088/8094/files/76675772441.pdf
    • https://cdn.shopify.com/s/files/1/0439/4732/7646/files/bashan_250_service_manual.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_off00005f24.bin
3b19d4bed40b64b5f7243786c65a86e82c6a6502f48bb6083c083d83d9a6d09b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F24 5636 bytes
font_01_sfnt_off00007262.bin
e7831929061ea1fe444c7f56030197260ba40628c2801493941187b4a3f76528		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7262 9896 bytes

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