Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8586c5787f3da28…

MALICIOUS

PDF

41.6 KB Created: 2020-08-07 04:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcbb96b811ac8c0b994f40e391650adb SHA-1: a075394c9acf236c5d9ff5c2f5d506640cc88547 SHA-256: a8586c5787f3da281c11bf0891b8fd4b4dbcd17bf92189769702501d92841407
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggered this heuristic. The presence of a large link farm suggests an attempt to manipulate search engine results or to distribute malicious content through a variety of seemingly legitimate-looking links.

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.ru/pify?keyword=evento+cerebrovascular+isquemico+pdf
    • http://files.alisondowell.com/uploads/1/3/2/3/132302982/bokiboxuzakejut_zutowo_webifisajod.pdf
    • http://files.klbavarianwaxart.com/uploads/1/3/1/8/131856713/0e35d0df837e.pdf
    • http://vefipawos.hellosquatch.com/uploads/1/3/1/0/131070374/xelegomivix.pdf
    • http://files.seohye.com/uploads/1/3/2/7/132740375/tisuvenowidatik_pumosuje.pdf
    • https://cdn.shopify.com/s/files/1/0436/3105/0915/files/tozek.pdf
    • https://cdn.shopify.com/s/files/1/0437/1090/6518/files/53967608457.pdf
    • https://cdn.shopify.com/s/files/1/0439/5817/3854/files/60055761629.pdf
    • https://cdn.shopify.com/s/files/1/0428/6801/5260/files/51762891878.pdf
    • https://cdn.shopify.com/s/files/1/0432/8521/7436/files/46772869789.pdf
    • https://cdn.shopify.com/s/files/1/0432/2105/7700/files/31268686607.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7063/files/ruturegumodiponudivafize.pdf
    • https://cdn.shopify.com/s/files/1/0431/4431/5029/files/69324127972.pdf
    • https://cdn.shopify.com/s/files/1/0430/9165/6864/files/break_my_heart_again_piano.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/47216322682.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/minecraft_scoreboard_command.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_off00006468.bin
518cdbaa2f5bfbb44494b626279a6b54bd4396d76bfe6d643c585a29b7491ed0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6468 5584 bytes
font_01_sfnt_off00007750.bin
a53a52b6afe43ecdcdb2c4fcd6aa29ecb8faaff6b4410a22f8639fc8f723eb52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7750 10052 bytes

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