Malicious PDF — malware analysis report

Static analysis result for SHA-256 172f2c3a5d593308…

MALICIOUS

PDF

50.7 KB Created: 2020-08-18 16:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04e9ecac0c2aaaf789a8f0a581cd0bde SHA-1: 60c648080cba6d70316cf977879bafb656d85089 SHA-256: 172f2c3a5d593308b63f15f715593c0be22ce4246ed92d764e723854034cc0cf
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a significant portion pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, suggesting an attempt to direct users to malicious 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/pify?keyword=bdd+framework+for+selenium
    • http://files.brmerch.shop/uploads/1/3/1/1/131164027/vebanaba-nadav.pdf
    • http://dazumo.willmacmillanjones.com/uploads/1/3/0/8/130814328/fifanax.pdf
    • http://burixija.buttfarm.co.uk/uploads/1/3/0/8/130814328/ff6894998a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/4457/7178/files/wegitarovitolinigisen.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6605/files/50_things_the_holy_spirit_does.pdf
    • https://cdn.shopify.com/s/files/1/0435/9585/8083/files/53164427918.pdf
    • https://cdn.shopify.com/s/files/1/0437/6756/2394/files/important_dates_of_the_year_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6727/files/napefego.pdf
    • https://cdn.shopify.com/s/files/1/0432/0431/3247/files/the_cask_of_amontillado_plot_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0431/6554/8705/files/bwv_1001_presto_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0436/0034/7299/files/selusumoburovazenil.pdf
    • https://cdn.shopify.com/s/files/1/0428/2341/8019/files/wirara.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1105/files/diwogogutizas.pdf
    • https://cdn.shopify.com/s/files/1/0448/3586/4736/files/excel_lookup_worksheet_based_on_cell_value.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007914.bin
b9a7343919f4bccf046cbda4b3489c467f3da9336c0f17f906965865aba13c4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7914 5060 bytes
font_01_sfnt_off00008a37.bin
ebe45c7355e060bea47649fba336a025b0510417e82107f0dfbed8844a296811		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A37 11032 bytes
font_02_sfnt_off0000afab.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAB 4324 bytes

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