Malicious PDF — malware analysis report

Static analysis result for SHA-256 839faa6781dd070f…

MALICIOUS

PDF

49.9 KB Created: 2020-08-12 05:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a67cb600ea891d5caac1fb5a7c1630a1 SHA-1: c8bbeac50a13e7913a39f3250b6ead2073309f70 SHA-256: 839faa6781dd070fac2f966c5c95f3d4378759c1bb5cc634bd1cbf1f5d3113a5
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to lure users to a malicious redirector. The primary malicious URL is https://ttraff.cc/wb?keyword=conversion%20of%20temperature%20scales%20pdf, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other Shopify-hosted PDFs, suggesting a content-scraping or link-farming tactic to improve search engine ranking and distribute malicious links.

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.cc/wb?keyword=conversion%20of%20temperature%20scales%20pdf
    • http://tumozega.timberlandhomeinspections.com/uploads/1/3/2/6/132681504/7292013.pdf
    • http://files.med2u.com/uploads/1/3/2/8/132814972/5293885.pdf
    • http://files.vtfbla.org/uploads/1/3/2/6/132681294/bunupakagejow-lemofuxexorurax.pdf
    • http://files.chennaitiffinssandiego.us/uploads/1/3/0/8/130813934/926b3ba66.pdf
    • https://cdn.shopify.com/s/files/1/0431/3907/2161/files/45541410366.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/sekuzezowavavixerok.pdf
    • https://cdn.shopify.com/s/files/1/0428/2816/9382/files/rujaxigomi.pdf
    • https://cdn.shopify.com/s/files/1/0438/9987/9576/files/88919059179.pdf
    • https://cdn.shopify.com/s/files/1/0430/9159/1321/files/22._1_disclosure_form_illinois.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2060/files/al_arabiyyah_bayna_yadayk_book_2.pdf
    • https://cdn.shopify.com/s/files/1/0431/3654/9018/files/72351904660.pdf
    • https://cdn.shopify.com/s/files/1/0430/6108/4314/files/92393568477.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3447/files/saxovaxavebofonosize.pdf
    • https://cdn.shopify.com/s/files/1/0430/9955/3959/files/8934905565.pdf
    • https://cdn.shopify.com/s/files/1/0434/0101/9548/files/local_anesthesia_for_the_dental_hygienist_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7204/files/99994724678.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_off000075e7.bin
7ec3a62c81f5bb905be2b356c653eb58a96e45950fcdd6f785fcf82460bb9fdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75E7 5264 bytes
font_01_sfnt_off000087b0.bin
0e6edfc2a77300ce3696e7ce19714da5cd6fe97202c861f37146b7a4c99303ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87B0 16572 bytes

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