Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd2b3e103c627b9…

MALICIOUS

PDF

47.5 KB Created: 2020-09-01 04:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15403ac80930c5fbcc36dae65a625df4 SHA-1: acc6d1db19bac06bbb31b85b5a4b1237631c1805 SHA-256: 0fd2b3e103c627b917473aca8a17623dafe59937440b4c6c159d6d1f40bf9b72
174 Risk Score

Malware Insights

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

The PDF contains a prominent link to 'ttraff.com' disguised as a search result for 'Zalo apk mới nhất', indicating a lure for potentially malicious content. The PDF also hosts a large number of links to other PDFs, suggesting a link farm or redirection infrastructure. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.com/wix?keyword=zalo+apk+m%25E1%25BB%259Bi+nh%25E1%25BA%25A5t
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_9e0065230e734c89bf394a82127e6c96.pdf
    • https://static.usrfiles.com/ugd/217d68_5844f34857894db8b50b226ea6abba6a.pdf
    • https://static.usrfiles.com/ugd/07625c_5d69999c8ac7475e8c5b0855bc722821.pdf
    • https://static.usrfiles.com/ugd/12dc78_9f201edad7024d66a0b7410571fd3508.pdf
    • https://static.usrfiles.com/ugd/33a16d_eb5bd46bcc304932844bc11f8125479b.pdf
    • https://static.usrfiles.com/ugd/0c41e7_25f4e67fc7ca4e2287cee266ba68660f.pdf
    • https://static.usrfiles.com/ugd/67f5f7_6d304824d35b4140968158cb2cce40ac.pdf
    • https://static.usrfiles.com/ugd/f459ea_b5487d9cf6bf4126afe0f4f16bdda95f.pdf
    • https://cdn.shopify.com/s/files/1/0453/3600/2715/files/31749954448.pdf
    • https://cdn.shopify.com/s/files/1/0432/9232/8102/files/classifying_triangles_worksheet_gina_wilson.pdf
    • https://cdn.shopify.com/s/files/1/0430/0944/1953/files/tofobavekab.pdf
    • https://cdn.shopify.com/s/files/1/0434/5833/0786/files/mefamizozil.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8249/files/nuropujuw.pdf
    • https://cdn.shopify.com/s/files/1/0436/5733/0853/files/toximemobuwotalerodofa.pdf
    • https://cdn.shopify.com/s/files/1/0434/1517/5317/files/18285018196.pdf
    • https://cdn.shopify.com/s/files/1/0429/0225/7823/files/45218948855.pdf
    • https://cdn.shopify.com/s/files/1/0434/8415/1974/files/589757899.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000786f.bin
5e2fffb3d25fedb7d32bc1fbe104797aec0d90425b9da54c94768d7010fef8ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x786F 5232 bytes
font_01_sfnt_off0000897a.bin
d54e5f6f1c97acb905f95ebf77013d19bf4def54bfa91cb6694dd184d964acbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x897A 11600 bytes

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