Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fb74e9a7346b25…

MALICIOUS

PDF

52.0 KB Created: 2020-08-30 23:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8bc39b31262ee6eb43be96a31fde0e6 SHA-1: 0aa3b43c55ff504a3755426ff335d1b6b9a32041 SHA-256: 65fb74e9a7346b258a30d2c76f099c764acd2115981f3ede203ed37b5d648e2e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, which is designed to lead users to further malicious content. The presence of a "download" button lure and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a payload. The document body, though heavily obfuscated, contains a URL that aligns with the malicious redirector finding.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=waltr+2+key+windows
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/5a1791_c083efa2a4ed4b02b4f9e8f0a93b06ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd43c14f88954335ae0f6564ca109218.pdf
    • https://static.usrfiles.com/ugd/b8c837_d307585f8fdc43e7ab79e7c39acc6d58.pdf
    • https://static.usrfiles.com/ugd/f0e51d_0ec75719f010440bbd605bf1f5825074.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0869b92a508407a95528e431fe236b3.pdf
    • https://static.usrfiles.com/ugd/58a813_1c076339f23d4a2f9021a7426c15fc82.pdf
    • https://static.usrfiles.com/ugd/b8c837_82e8055f5a22495692bf1ad55f98445c.pdf
    • https://static.usrfiles.com/ugd/b8c837_24c4568d38144288a23f171b05086522.pdf
    • https://cdn.shopify.com/s/files/1/0452/1276/2263/files/2058344548.pdf
    • https://cdn.shopify.com/s/files/1/0431/7646/0445/files/uce_chemistry_past_papers.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/xofipemuzoziliwosa.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7493162631d4435b092bae9165f26ed.pdf
    • https://static.usrfiles.com/ugd/a86d68_b692ea61944643c781adbab5fae5434f.pdf
    • https://static.usrfiles.com/ugd/5bb01c_04c65c41a30d46748275875a0afc148d.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007869.bin
246e238e9c9ef86fbe87ec73ed93c176eedc6f5976c988bf3ff4fcbbb765efc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7869 2872 bytes
font_01_sfnt_off0000828d.bin
436bc21ecb4f4c96bf2719a3fcc007e00fbeed48a1835546272edb390c7b08ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x828D 5220 bytes
font_02_sfnt_off0000946f.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x946F 1800 bytes
font_03_sfnt_off00009cfd.bin
0db188459dafaff95e5ab33139b706821e87398cf02fb5e86d1e98ab59abb780		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CFD 10988 bytes

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