Malicious PDF — malware analysis report

Static analysis result for SHA-256 181908fd61dcd157…

MALICIOUS

PDF

50.0 KB Created: 2020-08-03 16:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2da9e89ecfe5b5fefc9799a02f21f18 SHA-1: fc789f7eca64d41f2a31b06ab7550d4f4bb48593 SHA-256: 181908fd61dcd157e2f843bb16e63a8a5898eebb0b9b5a43634165476bf2d562
162 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, disguised as a chemistry lab book. The ML classifier strongly indicated maliciousness, and the presence of a download button lure further supports a malicious intent. The document body itself contains the malicious URL and several other URLs pointing to PDF files, suggesting a link farm or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=chemistry+lab+book+pdf
    • http://files.africansafariimports.com/uploads/1/3/1/4/131407227/duxepad.pdf
    • http://files.quietcountryestates.net/uploads/1/3/0/7/130775522/bafomojigetolo-wutojum-kibaluwiwesax.pdf
    • http://files.blueridgecanineservices.com/uploads/1/3/0/8/130813373/werobube_fotigopunonino.pdf
    • http://files.noelandjackiesjourneys.com/uploads/1/3/1/4/131407445/7205449.pdf
    • http://files.onelasalle.com/uploads/1/3/1/4/131438142/duxezivelevu-jasinobelojopo-lodusolipur-jusos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7873/7310/files/14414117649.pdf
    • https://cdn.shopify.com/s/files/1/0429/4311/9527/files/bulamagovoti.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/3429907213.pdf
    • https://cdn.shopify.com/s/files/1/0429/5612/8412/files/36983538803.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51906755497.pdf
    • https://cdn.shopify.com/s/files/1/0436/7620/5209/files/sexidegijipopakorewogak.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6411/files/10176276718.pdf
    • https://cdn.shopify.com/s/files/1/0434/6383/5814/files/desktop_tablet_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0437/8545/3730/files/28515111326.pdf
    • https://cdn.shopify.com/s/files/1/0440/6145/8597/files/givugafo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/kivibiwepitekudoli.pdf
    • https://cdn.shopify.com/s/files/1/0431/8432/4770/files/18131439803.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/55880133837.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_off000085d8.bin
7c39f075fd3018e3aa6307e23d0b922afa3d6a28de1feafdf7172a7a2d129180		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85D8 5492 bytes
font_01_sfnt_off00009856.bin
25b666f057bfe14ce1669cfafc33c2d5e294d4d92155ff86034a5e7fd475b7a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9856 10276 bytes

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