Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b5222fea64e50f…

MALICIOUS

PDF

42.2 KB Created: 2020-08-15 13:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 146f8ef5be2876d0f9cf5965a8652bcb SHA-1: faec0ba9c3b28fe46087e3a44233f0ff57d4de7f SHA-256: 73b5222fea64e50fed339ffa11e4a2043e498e1e9990a24c14a6d2542315677d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of a suspicious URL strongly indicate a malicious intent to redirect the user. The ML classifier also flagged this PDF with high confidence, supporting the malicious verdict.

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/wb?keyword=infinitives%20and%20ing%20forms%20pdf
    • http://files.littleprincedoulaservices.com/uploads/1/3/1/6/131637043/jisopawujexe.pdf
    • http://files.mariasatira.com/uploads/1/3/0/9/130969708/3270438.pdf
    • http://files.icecreamstones.org/uploads/1/3/2/8/132814518/sodaw-geviwufabujemud-vobove-tabut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/6845/7122/files/bufil.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/61620747.pdf
    • https://cdn.shopify.com/s/files/1/0431/1482/3844/files/rufikaze.pdf
    • https://cdn.shopify.com/s/files/1/0427/7266/0390/files/86815758416.pdf
    • https://cdn.shopify.com/s/files/1/0438/3938/9856/files/nesowopozanotubidikabije.pdf
    • https://cdn.shopify.com/s/files/1/0438/0635/9713/files/burexefaraso.pdf
    • https://cdn.shopify.com/s/files/1/0433/7339/6133/files/business_report_writing_samples.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3464/files/puxiwitikivetujosapegosoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/5999/4014/files/definition_of_guidance_and_counselling_by_different_authors.pdf
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/delunulesif.pdf
    • https://cdn.shopify.com/s/files/1/0428/7902/5318/files/minusisetodekefixosizefi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2778/4095/files/when_does_pumpkaboo_evolve.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_off00005c96.bin
19d78f6447a17956afbd999c627adbf3d16a9833a1dd9878174cc11b9da054b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C96 5112 bytes
font_01_sfnt_off00006de2.bin
159ee7cc36f72e211947b726e939d3f0467c6aea5eaaeb0482efcc01ea4bb6f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE2 9412 bytes
font_02_sfnt_off00008e24.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E24 4324 bytes

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