Malicious PDF — malware analysis report

Static analysis result for SHA-256 169b966db7bcf580…

MALICIOUS

PDF

53.4 KB Created: 2020-08-30 08:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8929a3758558750802d2f2bad7e118b SHA-1: 8470de186baf7267262e600855e1bfdfd25bb75a SHA-256: 169b966db7bcf580f0145e1e654783db6be9f1ea476375d8633b0bcae8cc32db
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, pointing to 'https://ttraff.cc/wix?keyword=birth+by+sleep+ability+melding+guide'. Additionally, it exhibits characteristics of a link farm, embedding numerous external PDF links, with 'https://cdn.shopify.com/s/files/1/0428/5300/7526/files/kaplan_nursing_entrance_exam.pdf' being the first identified. The document body, though heavily obfuscated, contains the malicious URL, suggesting the document's primary purpose is to redirect users to potentially harmful content.

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/wix?keyword=birth+by+sleep+ability+melding+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5300/7526/files/kaplan_nursing_entrance_exam.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21533622499.pdf
    • https://cdn.shopify.com/s/files/1/0438/4414/1218/files/google_package_tracking.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/66425421637.pdf
    • https://static.usrfiles.com/ugd/e5a943_d1c01c57b47a49098b33b0a998e18ba3.pdf
    • https://static.usrfiles.com/ugd/921909_0a06b3d962ca464489ba8d2e43edbf3d.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ec54658663d40dda07b4a9180666798.pdf
    • https://static.usrfiles.com/ugd/b8c837_de634ada4f454ed1aa0ee8463617ecf0.pdf
    • https://static.usrfiles.com/ugd/5ecadc_8a0c65bc902c40c591cff36de658c2d1.pdf
    • https://cdn.shopify.com/s/files/1/0431/4605/1744/files/zadupodomof.pdf
    • https://cdn.shopify.com/s/files/1/0428/0333/1231/files/pebosunitevumigapeguji.pdf
    • https://cdn.shopify.com/s/files/1/0435/1547/8176/files/xalazijaneza.pdf
    • https://cdn.shopify.com/s/files/1/0431/7904/9121/files/3491024687.pdf
    • https://cdn.shopify.com/s/files/1/0440/6562/0118/files/67384613497.pdf
    • https://cdn.shopify.com/s/files/1/0430/0416/6297/files/woxisepipuliwugov.pdf
    • https://cdn.shopify.com/s/files/1/0429/5373/6348/files/mamavatupenaruwowigo.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_off0000873c.bin
4d914c62cb60254108b208ac2090afc6e71b5cb08250b41a2a5b84e8d15fb825		 pdf-font-stream PDF embedded font (sfnt) at offset 0x873C 5664 bytes
font_01_sfnt_off00009a53.bin
8c85733f13bb04b08850919a8be38311029076b799e1074a322143dfcd61bd4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A53 14984 bytes

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