Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad9374d477617d8…

MALICIOUS

PDF

46.0 KB Created: 2020-08-19 08:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b6360a9a1c97c7ff67fbfbbd04f02d7 SHA-1: 9873e0f34f947e64a411e182b2bff38f25b84c79 SHA-256: 0ad9374d477617d8d8ecfcf020ad7dc1e3126608d508338a498dfbb78b19bfad
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body disguised as a book title. This link, 'https://ttraff.cc/pify?keyword=complete+anglican+hymns+old+and+new', likely serves as a lure to redirect users to malicious infrastructure. The presence of numerous other PDF links, many pointing to Shopify domains, suggests a link farm or content distribution network being abused for malicious purposes. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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/pify?keyword=complete+anglican+hymns+old+and+new
    • http://zejub.piecesearlylearning.com/uploads/1/3/1/3/131398504/6452863.pdf
    • http://files.cacpalopinto.org/uploads/1/3/1/4/131453715/9c1ea2f2ce.pdf
    • http://files.humanprojectmusic.com/uploads/1/3/0/8/130874594/pevojesirokar-kusixojo-xubiriripuw-jufegaxifes.pdf
    • http://files.vipneurorehab.com/uploads/1/3/1/4/131483584/ritetejabebale.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3100392900.pdf
    • https://cdn.shopify.com/s/files/1/0449/5143/7480/files/gejanafuxegumunuzipunud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/33115388051.pdf
    • https://cdn.shopify.com/s/files/1/0427/9592/5671/files/german_learning_books_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/8806/8254/files/81619453454.pdf
    • https://cdn.shopify.com/s/files/1/0440/3711/1973/files/gidolakilowav.pdf
    • https://cdn.shopify.com/s/files/1/0443/8137/2582/files/simple_present_affirmative_form_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2672/files/89665112047.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9037/files/vufifekezos.pdf
    • https://cdn.shopify.com/s/files/1/0438/1101/2770/files/appetizer_definition.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_off00007265.bin
051f2fea17460457821bc75764bcbb550ffc9a270c0bf4d11bd097e16344aa99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7265 5492 bytes
font_01_sfnt_off000084f9.bin
808393da9bca02e38873cce0436e79c2b01c9198c82a085b09dd0e2be08524d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84F9 11220 bytes

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