Malicious PDF — malware analysis report

Static analysis result for SHA-256 189ab857bcc383a8…

MALICIOUS

PDF

34.1 KB Created: 2020-09-10 14:39:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edbbd1a547f6d747b81fa52534e1c302 SHA-1: 0560641b18dcb90ebefe440dbd9355d01ccd7ab6 SHA-256: 189ab857bcc383a8f92b53c4064f62ea0f339eb2d4fc98c8d6aee145f3047e4a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain keywords related to the redirector's URL, suggesting a lure. The presence of numerous external PDF links, many pointing to benign Shopify domains, indicates a link farm strategy, likely to improve SEO for the malicious redirector. No scripts were extracted from this sample.

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.me/wix?keyword=wolf+howling+at+moon+pumpkin+template
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8122/7670/files/58432235546.pdf
    • https://cdn.shopify.com/s/files/1/0443/9549/5590/files/6th_grade_math_decimals_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/6517/1354/files/kukitetewak.pdf
    • https://static.usrfiles.com/ugd/529dbf_eec6f38b33bf41489f435b590ea844ec.pdf
    • https://static.usrfiles.com/ugd/011e4b_d47d5300d653445eb54ba19f70fa40d1.pdf
    • https://static.usrfiles.com/ugd/628a76_a900e88099a44ea185ffd1ecd842003a.pdf
    • https://cdn.shopify.com/s/files/1/0432/5048/3368/files/kagesifegubugexoluvoba.pdf
    • https://cdn.shopify.com/s/files/1/0431/7478/9281/files/aldose_and_ketose.pdf
    • https://cdn.shopify.com/s/files/1/0437/4118/4165/files/update_xbox_one_controller_pc.pdf
    • https://cdn.shopify.com/s/files/1/0439/6548/1118/files/adverse_childhood_experiences_test.pdf
    • https://static.usrfiles.com/ugd/63022f_ca7a5b0498a24634ad5fc34ccb17fbd0.pdf
    • https://static.usrfiles.com/ugd/724fb5_3c045225e13f4eaaa36878c34e7cce8f.pdf
    • https://static.usrfiles.com/ugd/3ce946_0b755047f60f4b6a8c03379da5c290c7.pdf
    • https://static.usrfiles.com/ugd/8acad3_6efb34b557124fe2bd07976cd2ff037d.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_off00004746.bin
f84014e2ad76a1e48dc9071782c772827ac5869f3b09876c556623af2e6aa10a
pdf-font-stream PDF embedded font (sfnt) at offset 0x4746 5208 bytes
font_01_sfnt_off000058ff.bin
c277c3625cc3211f4337c18df5a7be1bcbf7e25bcc42ce33ac798cc6820ebcd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x58FF 10276 bytes