Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f45b52586dff0d0…

MALICIOUS

PDF

42.1 KB Created: 2020-08-30 20:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2212a15211c9a7318b505b532e0494ae SHA-1: a88433ce13add77b7d29f501ad792ba213a3a924 SHA-256: 5f45b52586dff0d0d787aeb01f6786a2a71dcc0bf6ccd3d05f34530eda60d621
154 Risk Score

Malware Insights

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

The PDF contains numerous links, masquerading as IELTS listening materials, that point to a malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to distribute malicious content. The embedded URLs are likely intended to lead the user to a compromised site or a phishing page.

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.cc/wix?keyword=ielts+listening+answer+sheet+pdf+201
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9531/7918/files/4_unit_apartment_building_plans.pdf
    • https://cdn.shopify.com/s/files/1/0434/8205/4813/files/bimanujebubobitoga.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7755/files/adobe_reader_to_word_converter_online.pdf
    • https://cdn.shopify.com/s/files/1/0447/1685/1356/files/xememuralepimuzubimiwa.pdf
    • https://cdn.shopify.com/s/files/1/0439/0112/4760/files/rafiwaxegep.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7ff80c11ae94b4089f18f942b4414f5.pdf
    • https://static.usrfiles.com/ugd/9e53d4_0befb644251c4b38a1afc7138855321e.pdf
    • https://static.usrfiles.com/ugd/822ecd_3e9bbe9e81324442a42ef99123d21cd6.pdf
    • https://static.usrfiles.com/ugd/b8c837_da61417200a94ceba3db15df1b75b394.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d3cc17852454d7e8de1d08a46563404.pdf
    • https://static.usrfiles.com/ugd/b8c837_1124598a48d94bf580c3318371b091c7.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a73af7e2b0f4ecca4c2399887728be6.pdf
    • https://static.usrfiles.com/ugd/cf14a4_5178a70cc863461784f1ec12cb0ffa97.pdf
    • https://static.usrfiles.com/ugd/8cbfce_ae080fd8d4294f70a265549acc375dfd.pdf
    • https://static.usrfiles.com/ugd/4c76bf_32a442e095b64515b26fd0a2a9dc0c2f.pdf
    • https://static.usrfiles.com/ugd/b8c837_f3b86c16dfe740c0a94601885d5d65a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_c20b638aa6674bffbd0ea5704d0f8d8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_15186ec41161480583a176251b50e5bb.pdf
    • https://static.usrfiles.com/ugd/b8c837_27a577f8b893433c9ea88e071f5676a5.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_off00006555.bin
159a21d4d52c53f5c29b42c636bad78bc58a5788617f2411f4a65918bb05ce40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6555 5656 bytes
font_01_sfnt_off0000789c.bin
f8fa4bd965e20bb9479731b3c5ecef119bba2a817530d8c356de5af41145b14c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x789C 10052 bytes

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