Malicious PDF — malware analysis report

Static analysis result for SHA-256 045ae9af7308e24a…

MALICIOUS

PDF

63.7 KB Created: 2020-09-17 03:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ee59b745376d82acc8fc7c2ad700cf8 SHA-1: 6d1d856e905478fc2a7b34036e4c31ec2c8b246a SHA-256: 045ae9af7308e24a781d7ce86b59f9eef535d2791ddfd3c354836187cc44cd5b
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a search result for 'solubility problems with answers pdf'. The document also features a large number of external PDF links, many of which are hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly indicated maliciousness.

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.club/wix?keyword=solubility+problems+with+answers+pdf
    • http://files.edcmissouriflatupdate.com/uploads/1/3/0/7/130739398/5756321.pdf
    • http://tinela.eokguidance.com/uploads/1/3/2/3/132302780/vimimune-nukotozepiv.pdf
    • http://files.itanecoleman.com/uploads/1/3/1/4/131437318/3061225.pdf
    • http://files.projectlinuspgh.org/uploads/1/3/2/7/132740463/3cf5f2de36.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0483/5849/0275/files/angrez_2_full_movie_watch_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/4915/6757/files/negabipe.pdf
    • https://cdn.shopify.com/s/files/1/0459/8982/2631/files/wonopasonivojin.pdf
    • https://cdn.shopify.com/s/files/1/0431/2878/3002/files/79422327571.pdf
    • https://6574aceb-2ab7-4e69-a8df-da4831201d94.filesusr.com/ugd/26f730_71b8f3424a35491287603655a1406ee2.pdf?index=true
    • https://13fb088d-7158-43d5-85ac-3f57e5ae950b.filesusr.com/ugd/9c66ff_a0601ffff2ff4c9da5eacdcfd9322956.pdf?index=true
    • https://10b88c5d-8a7f-4f73-aced-227a64e44ffd.filesusr.com/ugd/e3ed1f_62efd4b510d24fa0a49de5cb0cf79098.pdf?index=true
    • https://293f0243-eb43-40e8-a6bf-7288d9b6a828.filesusr.com/ugd/e3ed1f_88f2df2d18e4400b81a003cb84f71418.pdf?index=true
    • https://23d551db-2651-4c13-82f8-4d8648df75a2.filesusr.com/ugd/4ae4db_3577696454ec4440aa74d36cb09c0cdc.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009609.bin
bb35d61fa52140cf4466da9c7b17532083d2e32a804a32eaabf4fba720f4d3d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9609 5720 bytes
font_01_sfnt_off0000a964.bin
597cc741243ffb31aa72a88b6ad7b4da14cef6bd042f7308a5247bfc916773f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA964 16376 bytes
font_02_sfnt_off0000dc57.bin
61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC57 16096 bytes

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