Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d9c01d76ff7a3a…

MALICIOUS

PDF

37.9 KB Created: 2020-08-27 15:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9231119e22709892af674227c620c51 SHA-1: 81e6bc42fb22f3a414b41df797b94d3ada960127 SHA-256: 56d9c01d76ff7a3acfb490a971ae9c1609699eac21eee97a9b257d5e3e756360
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as a download for a popular IT security book, but the primary link redirects to a known malicious domain. The ML classifier strongly indicated maliciousness. The document body itself is heavily obfuscated but contains the malicious redirector URL and several benign-looking Shopify URLs, likely part of the link farm.

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=shon+harris+cissp+7th+edition+download
    • http://nodepiga.praisetabernacle.com/uploads/1/3/2/7/132740435/9552159.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/litifudivumabog.pdf
    • https://cdn.shopify.com/s/files/1/0432/7754/9728/files/vevarabigotolezula.pdf
    • https://cdn.shopify.com/s/files/1/0439/1269/1867/files/11443161864.pdf
    • https://cdn.shopify.com/s/files/1/0448/2859/0242/files/2014_mustang_brochure.pdf
    • https://cdn.shopify.com/s/files/1/0434/0655/7347/files/blank_month_calendar_template_2018.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/hitman_blood_money_compressed.pdf
    • https://cdn.shopify.com/s/files/1/0428/0591/9903/files/xenedexujifokugebo.pdf
    • https://cdn.shopify.com/s/files/1/0463/4640/4002/files/tsh_in_pregnancy_guidelines_canada.pdf
    • https://cdn.shopify.com/s/files/1/0431/8933/8276/files/55328122486.pdf
    • https://cdn.shopify.com/s/files/1/0432/5670/9288/files/rifemadapevupafadet.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_off0000566d.bin
01b709dea0460c5c9baf2968d5e849df9dd52614b0ffe5fb8b0c974941d6a009		 pdf-font-stream PDF embedded font (sfnt) at offset 0x566D 5436 bytes
font_01_sfnt_off000068ee.bin
0dbaf376f54af2d763f0785af508ba8946fea62ffb585c8e21eef82ad0985ad1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68EE 9864 bytes

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