Malicious PDF — malware analysis report

Static analysis result for SHA-256 13211b8fc0b512ed…

MALICIOUS

PDF

40.7 KB Created: 2020-08-14 04:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5eadfb808a2db39fcb3e0903ed79e3c1 SHA-1: 71bde6be983cb2cb548e7d5c4cc3d36220829983 SHA-256: 13211b8fc0b512ed4839466e6679f3756e2ad649cbba1c8253bc12d76c2aeea8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically a URL designed to look like a search for 'kindle fire read pdf books'. The document body also contains this URL, alongside numerous other PDF links, suggesting a link farm or redirection attempt. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=kindle+fire+read+pdf+books
    • http://jajoxanez.linguisttimothyashe.com/uploads/1/3/0/7/130775034/82264c4c1f943.pdf
    • http://files.jennygodley.com/uploads/1/3/0/7/130739693/woninup-muxema-zesegosota.pdf
    • http://files.theyorksociety.com/uploads/1/3/1/4/131407112/nigezuwanabezu.pdf
    • http://files.yardieting.com/uploads/1/3/2/6/132682303/guxeretukewegun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2571/0750/files/simple_punctuation_rules.pdf
    • https://cdn.shopify.com/s/files/1/0427/4189/1238/files/55567265342.pdf
    • https://cdn.shopify.com/s/files/1/0447/7625/9735/files/statistical_methods_for_social_sciences_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/7347/8560/files/6185897966.pdf
    • https://cdn.shopify.com/s/files/1/0435/4847/5541/files/fundamentals_of_communication_systems_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6666/files/85156440151.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5974/files/79351230389.pdf
    • https://cdn.shopify.com/s/files/1/0437/1080/8213/files/network_marketing_file.pdf
    • https://cdn.shopify.com/s/files/1/0437/7804/8162/files/ars_poetica_horace_summary.pdf
    • https://cdn.shopify.com/s/files/1/0432/1011/3186/files/chemistry_zumdahl.pdf
    • https://cdn.shopify.com/s/files/1/0428/5677/5839/files/ziwisovuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/bafusirafugo.pdf
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/97127317777.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_off000061ef.bin
f4fd58af39931b02e1d350608187bada1d03d367f1ec841070c47e8c993586ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61EF 5208 bytes
font_01_sfnt_off0000739c.bin
1301b6f37f6a8f5578d124b1466d361ac95a5d98c83116ad54ef9c75cecc3010		 pdf-font-stream PDF embedded font (sfnt) at offset 0x739C 10116 bytes

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