Malicious PDF — malware analysis report

Static analysis result for SHA-256 5616836820331043…

MALICIOUS

PDF

35.0 KB Created: 2020-08-14 20:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 000a41ac32d157ef9982f53adacd7271 SHA-1: 79c3c0c88986066ee131142dbc5bcb92a3d4dcca SHA-256: 56168368203310430705a42413da8a408d345b9f0cedd81f3a661e80255ccbd7
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of these links, 'https://ttraff.cc/wb?keyword=plural%20possessives%20worksheets', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to lure the user to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=plural%20possessives%20worksheets
    • http://files.mjratts.com/uploads/1/3/2/6/132695200/7886274.pdf
    • http://files.thefoodiepharmer.com/uploads/1/3/1/3/131379296/b5aed9364.pdf
    • http://files.andymonin.com/uploads/1/3/1/3/131384583/badca6c.pdf
    • http://dogamo.dessertdesignsbygisela.com/uploads/1/3/0/7/130738946/gaselojupekuxi.pdf
    • http://najej.northbattlefordhomehardware.com/uploads/1/3/0/8/130814174/zubinupozisatinukus.pdf
    • https://cdn.shopify.com/s/files/1/0430/0872/1045/files/38843524821.pdf
    • https://cdn.shopify.com/s/files/1/0438/2107/2541/files/survey_of_accounting.pdf
    • https://cdn.shopify.com/s/files/1/0443/8809/0022/files/buffalo_dairy_farm_design.pdf
    • https://cdn.shopify.com/s/files/1/0431/4995/1138/files/jeginuvuzuwe.pdf
    • https://cdn.shopify.com/s/files/1/0430/7392/9377/files/latazilovoge.pdf
    • https://cdn.shopify.com/s/files/1/0433/9128/7452/files/5891172644.pdf
    • https://cdn.shopify.com/s/files/1/0429/8070/4405/files/45459313181.pdf
    • https://cdn.shopify.com/s/files/1/0430/6088/7705/files/dujanivujapub.pdf
    • https://cdn.shopify.com/s/files/1/0447/3788/8410/files/naming_alkanes_practice_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/3547/6636/files/tasebupezibuxetu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1220/2389/files/fejaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/35556067471.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/bluejackets_manual_25th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dejotoxirebogoro.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_off00004ba9.bin
f5fef99f6e4931c64420e60597c31b8fedcf26da43a6ff0dde9d45b96d7b3e4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x4BA9 5124 bytes
font_01_sfnt_off00005d1b.bin
e9df952900c042c8b7d403df4d1fe77783737916d510291e644ebe29386b1a73
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1B 9820 bytes