Malicious PDF — malware analysis report

Static analysis result for SHA-256 500e3f6aab6de880…

MALICIOUS

PDF

45.8 KB Created: 2020-09-06 05:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be5ec1acc409355b957b4d08b91581b3 SHA-1: 26425cb500ee6d56acba51e0cf2afb588a01fb3c SHA-256: 500e3f6aab6de8807d25052db99301eaa8d7ef35eca51e8eef517124cbf9bb44
150 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing indicating it is a malicious redirector link, pointing to a URL that appears to be a search result for a 'bourns potentiometer manual'. This URL is also listed as an embedded URL within the document body. The file also exhibits characteristics of a PDF link farm, with numerous external links, many of which are benign but likely serve to mask the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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.me/wix?keyword=bourns+potentiometer+manual
    • https://static.usrfiles.com/ugd/9f6a24_4fd43d96d76141a8a6f0b0ace200e75a.pdf
    • https://static.usrfiles.com/ugd/a18aa6_7145ca43c3304613bac421220c219d34.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_41f53f052542446e9bbb2df2a9c41eb2.pdf
    • https://static.usrfiles.com/ugd/e4f6f0_c89a2c8a609b44cb90d42bc722efeb51.pdf
    • https://static.usrfiles.com/ugd/5a4aad_69c453c299a5469389ba2c62d798a98b.pdf
    • https://static.usrfiles.com/ugd/40512e_98985cda358c49d4b9036d74d8ca16fa.pdf
    • https://cdn.shopify.com/s/files/1/0434/0069/1868/files/41280476864.pdf
    • https://cdn.shopify.com/s/files/1/0450/0835/5486/files/hack_wifi_android_wpa2_psk.pdf
    • https://cdn.shopify.com/s/files/1/0433/9338/4599/files/manevoresorakevigerokiwes.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8607/files/criminal_psychology_books_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0432/5031/9528/files/66805316653.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9292/files/34986549623.pdf
    • https://cdn.shopify.com/s/files/1/0432/3636/0351/files/konodovamoge.pdf
    • https://cdn.shopify.com/s/files/1/0431/8566/8259/files/penenogasavijemi.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_off000066bc.bin
9ae41fe65340d0ae98e6f6df4a5e2a4f18f90b1e904aa57040bdff64c10ba173		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66BC 4896 bytes
font_01_sfnt_off0000773d.bin
ed9c4199fee64e021ebb1c17b814506305368cfc8530e03e9a2e9fc0f5139ba8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x773D 10368 bytes
font_02_sfnt_off00009aac.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AAC 4324 bytes

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