Malicious PDF — malware analysis report

Static analysis result for SHA-256 0166e8edb01a6b1c…

MALICIOUS

PDF

47.3 KB Created: 2020-07-30 00:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7241b8e693d543902be626c036682cb2 SHA-1: cdfdb26e47f4624f9cde55a5c1c87f12cfb07134 SHA-256: 0166e8edb01a6b1c7a652c3476d53147e43b0c47ab4555158821b08957210951
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and heuristic analysis indicates it functions as a link farm, likely to distribute malicious content or phish users. The document body text is heavily obfuscated and appears to be junk data, suggesting the primary malicious function is via the embedded links.

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.ru/wb?keyword=chromatography%20principles%20and%20instrumentation%20pdf
    • http://files.barrons-conferences.com/uploads/1/3/1/4/131409170/3066792.pdf
    • http://files.meyrickestates.net/uploads/1/3/0/7/130776388/xojoti_runeriwodowesi.pdf
    • http://files.reikifortheplanet.com/uploads/1/3/2/3/132302815/5645773.pdf
    • http://files.saugusxc.net/uploads/1/3/2/6/132695543/goloxiv-mired-zakobegoselaten.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1553/6793/files/59559930803.pdf
    • https://cdn.shopify.com/s/files/1/0436/4576/3744/files/1169250602.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kuvesagapixunijibofalase.pdf
    • https://cdn.shopify.com/s/files/1/0433/5747/0872/files/zewufedeno.pdf
    • https://cdn.shopify.com/s/files/1/0427/9386/1279/files/51237303533.pdf
    • https://cdn.shopify.com/s/files/1/0430/0007/0307/files/86919084748.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jedajuzosefowi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8778/1276/files/keletijirepebikisitivud.pdf
    • https://cdn.shopify.com/s/files/1/0431/0453/4692/files/malofesuze.pdf
    • https://cdn.shopify.com/s/files/1/0433/0392/7973/files/14014032717.pdf
    • https://cdn.shopify.com/s/files/1/0431/8907/6117/files/10379968915.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5236/files/rotetaxinitazagelibese.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_off000071db.bin
9a98723dae936e7c7c8d502cfbcf27bf9f93cff28ba6a06675a6a95244fbc4de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71DB 1696 bytes
font_01_sfnt_off00007a05.bin
0fd5b756488457a4dcf45ca93be6ac56c7be12a7247b50b2305688d9996c3fc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A05 5576 bytes
font_02_sfnt_off00008cda.bin
d4769a4b96416f02fafa670c95d88bad5bb605ad07593d0ea613e08f963cac98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CDA 10028 bytes

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