Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0bd0a70ef6a541…

MALICIOUS

PDF

52.4 KB Created: 2020-08-14 02:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2b74c1cd3401d95148e661262855d62 SHA-1: fa94aaf44a69fe1e073f21e8383cd94d884d78eb SHA-256: 9b0bd0a70ef6a541f41684d1daf271a2f4568adb26b93c81e19e73dea6c7ddfe
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a mass external PDF link farm, with many links pointing to Shopify domains. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and embedded URLs, including the malicious redirector.

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/pify?keyword=neumonia+bacteriana+pdf+2018
    • http://sebuxage.newbeautynls.com/uploads/1/3/1/0/131069992/68c240.pdf
    • http://bufezemiw.clairefreeman.me/uploads/1/3/0/8/130814238/5a2879a0721e.pdf
    • http://files.aldenstidom.info/uploads/1/3/0/7/130776334/8162819.pdf
    • http://files.conniedillon.com/uploads/1/3/2/6/132681826/rixizilorewowopinu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2521/1296/files/wepijiguzi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3342/0195/files/bevamigez.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/janakuzofolesite.pdf
    • https://cdn.shopify.com/s/files/1/0444/6031/0695/files/pancreatitis_acute.pdf
    • https://cdn.shopify.com/s/files/1/0433/8660/1635/files/kicker_bundesliga_spielplan_2020_20.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/rilapuzemoxep.pdf
    • https://cdn.shopify.com/s/files/1/0433/8044/1238/files/burger_king_coupons_oktober.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0816/files/26219114952.pdf
    • https://cdn.shopify.com/s/files/1/0429/9302/5187/files/mosawugorebarim.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3468/files/junobifogokalinivisube.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/63509027222.pdf
    • https://cdn.shopify.com/s/files/1/0430/1085/0979/files/automated_payroll_system.pdf
    • https://cdn.shopify.com/s/files/1/0436/0624/5539/files/fosetunasekitosozuju.pdf
    • https://cdn.shopify.com/s/files/1/0439/8632/1566/files/10804257557.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a92.bin
2eb1acd8899228a9f6c258b50e34fcbf60a0e951a3f8245bdb021db8c2943f63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A92 5720 bytes
font_01_sfnt_off00009df6.bin
72c8ab64e3c8d3aab0398bad15eb257449d816aa6ca0056db7205991ff96d894		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DF6 11832 bytes

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