Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c1cbcaebfe249f…

MALICIOUS

PDF

58.5 KB Created: 2020-07-21 10:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16cf6b5324ed42eb6de7de14f4ba3218 SHA-1: 815379361315510aaa19b9e70f25d0d31516f096 SHA-256: 99c1cbcaebfe249fb7bc6611381e4d4a50f420673557210f5a85c8ccc47ee20e
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it's a malicious redirector link, pointing to 'ttraff.cc'. This URL is used in a lure to download a PDF, likely a phishing or malware delivery attempt. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'cardiac rehabilitation textbook pdf', reinforcing the lure.

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=cardiac+rehabilitation+textbook+pdf
    • http://files.comptekcomputers.com/uploads/1/3/1/4/131484133/jowegipemi.pdf
    • http://files.swsmith.com/uploads/1/3/0/7/130739198/6806635.pdf
    • http://files.goldgellgetaways.com/uploads/1/3/0/7/130740298/7919f87ccde429.pdf
    • http://files.ballardnightout.com/uploads/1/3/1/4/131408369/jumuxo.pdf
    • http://files.stsimonsconyers.org/uploads/1/3/1/3/131379743/zubumowumur_sufimenuliluto_losojutad.pdf
    • http://files.comptekcomputers.com/uploads/1/3/1/4/131484133/jowegipemi.pd
    • https://cdn.shopify.com/s/files/1/0439/4608/2472/files/zofedub.pdf
    • https://cdn.shopify.com/s/files/1/0432/7600/9632/files/32958663639.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/18043465958.pdf
    • https://pezelid.files.wordpress.com/2020/07/14114339601.pdf
    • https://vaxijaliburu766176138.files.wordpress.com/2020/07/sukamisizubaxisejufanekox.pdf
    • https://linujidiru785249151.files.wordpress.com/2020/07/21221249366.pdf
    • https://mobovowafe.files.wordpress.com/2020/06/bajefekokolebepave.pdf
    • https://cdn.shopify.com/s/files/1/0433/9515/4070/files/tupekati.pdf
    • https://cdn.shopify.com/s/files/1/0433/3781/0075/files/jegamoxabiturinin.pdf
    • https://cdn.shopify.com/s/files/1/0429/9695/7343/files/81414318080.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9815/files/lugusit.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9797/files/15675990528.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38935964995.pdf
    • https://cdn.shopify.com/s/files/1/0431/1462/7234/files/9643302950.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_off0000a57c.bin
80ec003c63292a3cad1c8f29c624fe543c68e83686f92b571f20ae90e480a5c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA57C 5148 bytes
font_01_sfnt_off0000b6f3.bin
6cc3ecd4a1d68695f55c42f16eba2e15ae6835314447ff9e636c3543a5b48b93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F3 11004 bytes

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