Malicious PDF — malware analysis report

Static analysis result for SHA-256 0224862434c8fc1c…

MALICIOUS

PDF

42.0 KB Created: 2020-08-11 04:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 867a92c42f72fb46ec43f7aa82d75e40 SHA-1: 36027a17872cbf6077d1ddcd6ed15752641ac2de SHA-256: 0224862434c8fc1cd22af137af85314c8c3ac130c9391b56112a7c0e1c0eb8b6
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a URL containing 'ttraff.cc'. The document body also contains this URL, presented as a download link for a free PDF. This indicates a phishing or scam attempt to redirect users to malicious content. The high ML score further supports the malicious classification.

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=affinity+designer+workbook+free+pdf
    • http://files.stjohn23rdministryofpresence.org/uploads/1/3/0/7/130776275/6604122.pdf
    • http://files.detail4less.com/uploads/1/3/2/7/132740553/4790180.pdf
    • http://files.texashandmadesuds.com/uploads/1/3/0/8/130874043/4930869.pdf
    • http://files.yiannchen.com/uploads/1/3/1/4/131483149/jemasug_sinem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/14724653058.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/duzowigagarejiroferegufi.pdf
    • https://cdn.shopify.com/s/files/1/0436/0214/9540/files/comment_fusionner_deux_fichiers_adobe_reader.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/23871574279.pdf
    • https://cdn.shopify.com/s/files/1/0438/2133/4688/files/77142221797.pdf
    • https://cdn.shopify.com/s/files/1/0434/2539/8946/files/come_monday_jimmy_buffett.pdf
    • https://cdn.shopify.com/s/files/1/0449/0684/0231/files/npt_tap_drill_sizes.pdf
    • https://cdn.shopify.com/s/files/1/0440/6116/3670/files/baunvo_bayern.pdf
    • https://cdn.shopify.com/s/files/1/0432/9714/4990/files/dumevejefamanezolowidajux.pdf
    • https://cdn.shopify.com/s/files/1/0434/2136/8482/files/fojufivutodunitite.pdf
    • https://cdn.shopify.com/s/files/1/0432/6991/4782/files/16414333372.pdf
    • https://cdn.shopify.com/s/files/1/0429/5101/6614/files/80323260022.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_off00005f26.bin
1b0df347815e46d3cf7fa4620195ad8055c4523d6058af53a0b2598e9b0dc9ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F26 5356 bytes
font_01_sfnt_off00007184.bin
bf70983b6b34f3b24dd67c19b6d9367f85ce55a07aa651d510a86c2e8e86043a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7184 13084 bytes

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