Malicious PDF — malware analysis report

Static analysis result for SHA-256 6998b25233ec4f16…

MALICIOUS

PDF

40.0 KB Created: 2020-08-05 12:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2981a467af2022b358596626cb684028 SHA-1: a38423fcaed3b3410eb1f9473f87f59d3fa783d9 SHA-256: 6998b25233ec4f16af81aca7618d64cf5b23af81549120f9cac776db895e7aaf
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body contains obfuscated text and URLs, suggesting an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

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=asymptote+worksheet+pdf
    • http://kuzanob.melanieveazey.com/uploads/1/3/0/8/130814017/4019662.pdf
    • http://files.stjohn23rdyouth.org/uploads/1/3/1/4/131483955/wemowetopezuru.pdf
    • http://files.monicacarrollart.com/uploads/1/3/1/6/131606431/81755a9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3702/3641/files/tube_digestif_de_l_homme.pdf
    • https://cdn.shopify.com/s/files/1/0428/3485/4051/files/50578605068.pdf
    • https://cdn.shopify.com/s/files/1/0446/7798/8505/files/introduction_to_html_css_and_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0431/5951/9387/files/javascript_replace_all.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vasopamomakazemujavinis.pdf
    • https://cdn.shopify.com/s/files/1/0429/8784/7843/files/80498478535.pdf
    • https://cdn.shopify.com/s/files/1/0432/4517/4939/files/34502867796.pdf
    • https://cdn.shopify.com/s/files/1/0450/6884/5208/files/phonetics_and_phonology_linguistics.pdf
    • https://cdn.shopify.com/s/files/1/0435/2311/3119/files/git_http_proxy.pdf
    • https://cdn.shopify.com/s/files/1/0432/3419/7666/files/xizelinugogakilekafalo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5027/0869/files/wigogazugexurazifadakeb.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2767/files/giboduzid.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4447/files/wogemuvit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9619/5737/files/53068998280.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_off00005ec6.bin
08b7958cb19fcc2a9f21695c1c67949428c2f2eeeb611c4d69a475bc0f04d4c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC6 5288 bytes
font_01_sfnt_off000070b4.bin
ff2253e4b1c67ed0a14bc7f9c9c4bc6a0c1cbe75c71bb99a734a52d9969c4705		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B4 10124 bytes

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