Malicious PDF — malware analysis report

Static analysis result for SHA-256 11747638b2a36eb2…

MALICIOUS

PDF

73.2 KB Created: 2020-08-04 00:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6ecc714f5dd52c86be893187c556d0c SHA-1: 01848bc5cb481e1715dcb5dad7bc11af05a48acd SHA-256: 11747638b2a36eb29532483f6090d1020c9660c3d17109ca31355100cc7ad3d4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=primary+prevention+of+cardiovascular+disease+pdf`. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, many of which are hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious.

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=primary+prevention+of+cardiovascular+disease+pdf
    • http://files.finnegansfieldsgypsyhorses.com/uploads/1/3/1/8/131871433/zubepuzoxej-nakuj-merozogaxane-nabofi.pdf
    • http://files.comprehensiblechinese.com/uploads/1/3/0/8/130813364/0dc2c3e.pdf
    • http://files.xinwenengineering.com/uploads/1/3/2/6/132695663/mavekam_mituvanur_bemasewiz_lugaterupinijub.pdf
    • http://files.light-snowboards.com/uploads/1/3/0/9/130970016/tojumajema_zarupom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3945/7431/files/69701892605.pdf
    • https://cdn.shopify.com/s/files/1/0434/0557/4309/files/punibomikafu.pdf
    • https://cdn.shopify.com/s/files/1/0436/1748/4957/files/dosovixukemeginunumere.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/firuvutefilawe.pdf
    • https://cdn.shopify.com/s/files/1/0437/7175/6698/files/vmware_workstation_15_pro_license_key.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/rearrange_pages_sejda.pdf
    • https://cdn.shopify.com/s/files/1/0431/0538/6647/files/dejele.pdf
    • https://cdn.shopify.com/s/files/1/0439/0522/0763/files/pexaxuzetotuwedikarepew.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1634/files/xevigufefowulabavafepe.pdf
    • https://cdn.shopify.com/s/files/1/0432/1050/6404/files/71662593984.pdf
    • https://cdn.shopify.com/s/files/1/0432/0637/7633/files/texas_driver_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/8593/0402/files/titokituv.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_off0000dfec.bin
68113cf21fa95ec0ea9d3cd260fe486ba75cf63f6f8e5fbab7bb4cc5a48f8c05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEC 5464 bytes
font_01_sfnt_off0000f27c.bin
0dd76721ce6519c204f55f1621971509e37d45e6142e51b098fcc77f82605e3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 10752 bytes

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