Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71d12b9cb3406bd…

MALICIOUS

PDF

41.6 KB Created: 2020-08-24 23:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 986223be1694dc3657201f5ac973beae SHA-1: 8b3c18d7e1d73d536a035358313d3b9d192c6f94 SHA-256: a71d12b9cb3406bd8670496e766e370fea94b758e77d869137ae7123432a3a66
150 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'free powerpoint baby shower invitation templates' and a URL that appears to be part of a link farm designed for SEO manipulation. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector is likely user interaction with the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=free+powerpoint+baby+shower+invitation+templates
    • http://pipatasiw.eatpeanutgallery.com/uploads/1/3/1/1/131164392/pikevutotuduse.pdf
    • http://files.pspconference.org/uploads/1/3/1/3/131398134/8337598.pdf
    • http://rigejoj.brett-andreas-portfolio.com/uploads/1/3/1/0/131070786/b5756be95e6bfd3.pdf
    • http://vejesu.chunkyharmonies.com/uploads/1/3/2/7/132710780/fifipixepedaron.pdf
    • http://files.champaignband.com/uploads/1/3/0/8/130814714/1c2f33554.pdf
    • https://cdn.shopify.com/s/files/1/0436/3180/4574/files/easter_event_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/tejexuzajunul.pdf
    • https://cdn.shopify.com/s/files/1/0433/9191/0038/files/62314805827.pdf
    • https://cdn.shopify.com/s/files/1/0446/7880/7705/files/dvd_players_repair.pdf
    • https://cdn.shopify.com/s/files/1/0432/1266/9089/files/37539050902.pdf
    • https://cdn.shopify.com/s/files/1/0437/9515/3058/files/xopelujetutuxadonet.pdf
    • https://cdn.shopify.com/s/files/1/0439/1796/7528/files/gokodofovugururulagig.pdf
    • https://cdn.shopify.com/s/files/1/0435/9861/0589/files/33396901052.pdf
    • https://cdn.shopify.com/s/files/1/0432/6352/5029/files/1171802905.pdf
    • https://cdn.shopify.com/s/files/1/0431/2550/6208/files/vixigazigevazevaxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/fefibarotinowi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0182/2875/files/bluestacks_apk_install_mac.pdf
    • https://cdn.shopify.com/s/files/1/0430/8100/7255/files/album_songs_status_tamil_video.pdf
    • https://cdn.shopify.com/s/files/1/0428/8161/3987/files/avicenna_ibn_sina.pdf
    • https://cdn.shopify.com/s/files/1/0432/2240/1192/files/9968817703.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/
    • https://cdn.shopify.com/s/files/1/0430/8100/7255/files/album_songs_status_tami

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056c7.bin
37ce7cd34ac72151a74be7ad6b842e9235a973f6f7ae4ccd71df7ff367c97ca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56C7 5196 bytes
font_01_sfnt_off0000684d.bin
3e72dc004511bb98b08d3ee9b8f9708577a40743fc4292795330beb4f50eb3c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x684D 10024 bytes
font_02_sfnt_off00008a87.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A87 4324 bytes

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