Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aab54af888faed4…

MALICIOUS

PDF

42.9 KB Created: 2020-08-15 06:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ae0f0a3a4c68a9e45572384d9111db4 SHA-1: c57b9073ee106569a5fd0ddb0adb16ecbae6573d SHA-256: 8aab54af888faed40434f0ac5e37b835912f11f444681c327d61b31d122d9884
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic firings indicate a PDF link farm, suggesting the primary purpose is to distribute malicious links or manipulate search engine results. The ML classifier strongly supports the malicious nature of this document.

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=backsplash+glue+sheets
    • http://files.ladymaeimpressions.com/uploads/1/3/1/3/131379434/ba398.pdf
    • http://buruwuwi.customglassandgranite.com/uploads/1/3/2/6/132681012/vonudik-jusijima-xejofi-gekese.pdf
    • https://cdn.shopify.com/s/files/1/0435/5781/4431/files/parametric_design_for_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0438/1959/7981/files/baudelaire_spleen_paris.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8128296882.pdf
    • https://cdn.shopify.com/s/files/1/0434/1602/7303/files/52825534810.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5093/files/iobit_game_booster.pdf
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/free_of_understanding_earth_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/1818/1016/files/qualitative_characteristics_of_accounting_information.pdf
    • https://cdn.shopify.com/s/files/1/0431/2147/5738/files/27369292761.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/86921169053.pdf
    • https://cdn.shopify.com/s/files/1/0434/7835/2034/files/sedewobot.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/62420471792.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7391/files/fovumejakebopew.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_off00006a96.bin
478c16e4759933939c26dabe6df097b394896312fba2f2c9f3cc60aac8860bc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A96 5212 bytes
font_01_sfnt_off00007c51.bin
dbebbea7e19b49aad9950a2579c5bbabb82a49e9b75eaf47e3e5d403bf6938a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C51 10192 bytes

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