Malicious PDF — malware analysis report

Static analysis result for SHA-256 07541855612ee73e…

MALICIOUS

PDF

37.7 KB Created: 2020-08-21 08:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38b2fad66cfdfff60348d8bbc10dd264 SHA-1: 8b5326a9568778220fd9a93d5fb54ce27429bae2 SHA-256: 07541855612ee73eb1d20dddf6fff696e27371a6f71cdf822b56ba4c76e60fd3
162 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector and many others forming a link farm. The document body, though partially corrupted, suggests a lure related to an 'answer key', and the presence of embedded links points towards a phishing or malware distribution attempt. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is part of a malicious campaign.

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.cc/pify?keyword=hsslive+computer+science+answer+key
    • http://ginexob.luminousmountain.com/uploads/1/3/1/4/131437709/zufeganur_rejidenibi.pdf
    • http://vivex.aishasuniquecosmetics.com/uploads/1/3/0/9/130969054/moxuxafumenob.pdf
    • http://tejizefa.catholicmedkc.org/uploads/1/3/2/6/132695550/2898458.pdf
    • http://files.oestore.shop/uploads/1/3/0/7/130775647/livaletip.pdf
    • http://files.afriendinrome.com/uploads/1/3/1/1/131164421/8744930.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9831/6707/files/dieta_alcalina_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0434/5944/4889/files/bifufefufuxig.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8306/files/32054867176.pdf
    • https://cdn.shopify.com/s/files/1/0431/4526/5318/files/75455417097.pdf
    • https://cdn.shopify.com/s/files/1/0438/6911/0432/files/26838204552.pdf
    • https://cdn.shopify.com/s/files/1/0440/4497/6278/files/83185991698.pdf
    • https://cdn.shopify.com/s/files/1/0434/2883/9581/files/jetivafilezezuvebovexux.pdf
    • https://cdn.shopify.com/s/files/1/0430/6481/9874/files/mivida_master_plan.pdf
    • https://cdn.shopify.com/s/files/1/0434/0740/9308/files/sonic_unleashed_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4434/files/xezifixopevi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0142/9662/files/76045722112.pdf
    • https://cdn.shopify.com/s/files/1/0440/4363/2805/files/axelos_itil_4_foundation.pdf
    • https://cdn.shopify.com/s/files/1/0432/6146/0644/files/bamurudoruvom.pdf
    • https://cdn.shopify.com/s/files/1/0437/8175/0941/files/nasironapiwewofufov.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_off00005412.bin
3cd518f989a5533201a09f3bc0feee7d467d0f33afcce97cbcb4ee70f40985ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5412 5356 bytes
font_01_sfnt_off0000664c.bin
d938b941e401de9531324f1a512b7269e74f47482a85e2f27d2670ab8c23dc46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x664C 9852 bytes

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