Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ee512cc545eed2…

MALICIOUS

PDF

103.2 KB Created: 2020-09-10 22:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d676c4bed77a820868caf108d34396c0 SHA-1: f9c511035ee63994247fb0385d4f0369f9ccd246 SHA-256: 72ee512cc545eed2c7ead9d65746916e8e72f1ff3f35395d60350fca0a401faa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs that redirect to malicious infrastructure, specifically a link farm designed to attract users searching for 'Oxford English Learner's Dictionary free'. The primary malicious URL identified is https://ttraff.ru/pify?keyword=oxford+english+learner%2527+s+dictionary+free. This suggests a phishing or malware distribution attempt disguised as a legitimate download. No scripts were extracted, but the PDF structure and embedded links strongly indicate malicious intent.

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.ru/pify?keyword=oxford+english+learner%2527+s+dictionary+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/badafb_f04bbd8419874bad88d740367b773e1f.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4e704b806b04769b2819c20efdb9da9.pdf
    • https://static.usrfiles.com/ugd/3be3a7_84dfc1334ea24a569672e8f250080e06.pdf
    • https://static.usrfiles.com/ugd/95089d_67725043daf64f1783ef99f030dddc62.pdf
    • https://static.usrfiles.com/ugd/9cb927_5eb0df948232403c94eab7c0bc05abe3.pdf
    • https://static.usrfiles.com/ugd/badafb_48f94ff656c84479885504bf94f570b0.pdf
    • https://static.usrfiles.com/ugd/6a4619_6f46121301e7442fa429a80c64910037.pdf
    • https://static.usrfiles.com/ugd/aaaf79_7519091cb7044c00ac21a847f7422872.pdf
    • https://static.usrfiles.com/ugd/60ffa2_a57d2b5173d246daa0df1d314ccaf93a.pdf
    • https://static.usrfiles.com/ugd/c83fdb_2323eec6f26c47e7aaf866c932dba0ca.pdf
    • https://static.usrfiles.com/ugd/78c764_1753a2bb7b59475fbe076dd2bb1411a1.pdf
    • https://static.usrfiles.com/ugd/9c0842_b8f6231932974e4ab8ad317666d61f31.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9d89722f75f483983a8e7d72e5640f8.pdf
    • https://static.usrfiles.com/ugd/ceb2e8_83d423f071d14c95aa904afd89578c60.pdf
    • https://static.usrfiles.com/ugd/30ea26_a71e62a42eb2497fa86d5c08b40eb0a5.pdf
    • https://static.usrfiles.com/ugd/74c34a_9f2b5e140e3e4192a6fb26f9085afa75.pdf
    • https://static.usrfiles.com/ugd/b8c837_cfed0368144b4d54898b2bde364a1518.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f49c.bin
efbe40651a84be4707ef25d52191b8da3b656b5f56db71d993b18b072c4a4357		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 27600 bytes
font_01_sfnt_off00014a8c.bin
076e69e8655bd37620718465d4a895ec25d73cd6fdf506e27a0489d053c4d5b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8C 5516 bytes
font_02_sfnt_off00015d61.bin
46e9ccd5fa86f4b8c21be444dfb178aa929bc5ceaf79f420491040dc9e7f16b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D61 17056 bytes

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