Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebe5e39be9253bdb…

MALICIOUS

PDF

45.7 KB Created: 2020-09-17 12:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eed307f0660b72f35cf65a0d049ab2c0 SHA-1: a8a666d7bb11395cdea408b6ee37a8e92e05a519 SHA-256: ebe5e39be9253bdb076e8b7465cf43142352b4b841ef1996b2ed7402314d7179
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=classic+8+conference+relays+2019'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are benign but likely serve to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated, but the primary intent appears to be luring the user to a malicious site via a deceptive link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=classic+8+conference+relays+2019
    • http://files.cockndragon.com/uploads/1/3/1/3/131379296/jizabexogadiwukutivo.pdf
    • http://files.andersonolineacademy.com/uploads/1/3/1/8/131858916/sekagedoko.pdf
    • https://0feaa883-a260-4f16-9888-8a36034c34b3.filesusr.com/ugd/54fa57_6933682aea8d49b6814494e97590eef7.pdf?index=true
    • https://675fa044-f89d-4b3d-93e2-690e7e8d6620.filesusr.com/ugd/a3b54b_0af8f2370c1c4550823ee8cbdb377873.pdf?index=true
    • https://702114eb-4a2a-4a08-8c77-fa6d76d9f24c.filesusr.com/ugd/576447_64758ff4a71f4f19abc7075a89ee2b18.pdf?index=true
    • https://02e86263-78fe-412d-8033-8175a14ecfc4.filesusr.com/ugd/d2751c_4bce819ca7ac4213877ef053f9c00695.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0434/0042/9731/files/20992838213.pdf
    • https://cdn.shopify.com/s/files/1/0431/7495/3120/files/puzupatubeluda.pdf
    • https://cdn.shopify.com/s/files/1/0433/0625/4504/files/30981877144.pdf
    • https://cdn.shopify.com/s/files/1/0454/7529/9478/files/adding_and_subtracting_mixed_numbers_with_like_denominators.pdf
    • https://cdn.shopify.com/s/files/1/0432/2649/7182/files/susaladoromonezufi.pdf
    • https://724bcd8e-62e8-456f-ac33-f8856cf9a6ca.filesusr.com/ugd/e42c35_f5cace9697e74be6acb720859fa12b5c.pdf?index=true
    • https://b9224086-0dd0-4def-9d61-2c6ccb6037e2.filesusr.com/ugd/681527_3cee98e11238480ea71cec886fad1322.pdf?index=true
    • https://bd29cd1d-2862-4ae7-928c-da2e937d6380.filesusr.com/ugd/3ddeef_b3d4287b26af4242915b4b6833077fee.pdf?index=true
    • https://ab984408-14e4-49c9-bf6f-a329bbd40d4d.filesusr.com/ugd/7aabb2_a032195457bb449781e040642627e239.pdf?index=true
    • 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_off00006701.bin
8269f297a6ea27cfa432b8cdd7493ad6fde08158dd847e5a91a7bb4c393ddfe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6701 5556 bytes
font_01_sfnt_off000079f6.bin
dcf78d671553d69656286f275db034b2997c723506fbc74172be7c203f3f643d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79F6 15584 bytes

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