Malicious PDF — malware analysis report

Static analysis result for SHA-256 901abc29c88e8761…

MALICIOUS

PDF

40.6 KB Created: 2020-09-18 05:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceec487664778ac674ea6bd7c9955fc7 SHA-1: 51bea4b16fdc66cd319fa0343b1d97ca40e83c98 SHA-256: 901abc29c88e876106e77eeeac024a98099ca01d064c5cf1951bca03a6f2fcd6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files, a technique often used for SEO poisoning or to distribute malicious content. One critical heuristic identified a link to a known malicious redirector at https://ttraff.link/wix?keyword=angel+banishing+symbol, indicating a likely attempt to lead the user to a malicious site. 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.link/wix?keyword=angel+banishing+symbol
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/boronuvixipanosuvazowunef.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0219/files/the_nutcracker_suite_piano.pdf
    • https://cdn.shopify.com/s/files/1/0461/9901/3526/files/73356238304.pdf
    • https://dbce2ebe-2318-4b66-a0fe-577fcc5c6b9b.filesusr.com/ugd/b3318b_cf5dbb621a6b4c13b79d8a0cbccccf0a.pdf?index=true
    • https://d82c41d9-6bc7-455a-9e5e-0a762c4b9b87.filesusr.com/ugd/99b222_cb6dd8f31b754e0c9b1902c82e744412.pdf?index=true
    • https://6466a07d-458c-4688-8334-534bfe9cba71.filesusr.com/ugd/7f46b5_1dcc1b1f74c04619989c7d072efd7fc0.pdf?index=true
    • https://c7907c62-50d3-482b-8ae8-97a2dedf39d0.filesusr.com/ugd/9d7ad9_397a736a24b74eea9fd6524796bea240.pdf?index=true
    • https://92b37b15-a37c-4997-a74e-dff323f81dd9.filesusr.com/ugd/d775a9_5f05555c8fab4b978ea4cdf30ab58013.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/44539025865.pdf
    • https://cdn.shopify.com/s/files/1/0435/3140/3423/files/new_york_farmhouse.pdf
    • https://cdn.shopify.com/s/files/1/0433/3748/2405/files/fnaf_2_office_desk.pdf
    • https://cdn.shopify.com/s/files/1/0434/0387/0375/files/85075002358.pdf
    • https://cdn.shopify.com/s/files/1/0431/9651/4461/files/64416753816.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1164/files/flutter_auricular_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/6821/0852/files/business_management_system_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/3144/5156/files/dot_alt_code.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000631b.bin
7bc6693c547796151073bd17f9deb937ed64eac72d95df5bf41e0d699e36b3f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x631B 5236 bytes
font_01_sfnt_off000074d5.bin
7835850b0a47e8b0395bac3ec11e4bde57dd4bfac035da69ac965778a33e2a86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D5 9732 bytes

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