Malicious PDF — malware analysis report

Static analysis result for SHA-256 f537bd813653ea8e…

MALICIOUS

PDF

76.8 KB Created: 2020-08-08 04:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7e0df561db966391a1b7b7548342a16 SHA-1: 0f1dfc35070ec09377a31418ee34376c8e92afe0 SHA-256: f537bd813653ea8e16f9bb9797f38fdb5bc172893a4a13f5620abc146bb05ace
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector at 'ttraff.com'. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. The document body is heavily obfuscated, but the malicious URL is clearly visible within the text.

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.com/pify?keyword=capital+humano+definicion+pdf
    • http://files.dutchbudha.com/uploads/1/3/1/3/131383456/f7418fd.pdf
    • http://files.singaporeaerosupportservices.com/uploads/1/3/0/8/130873715/pitenutivu-salibi-nasobakod.pdf
    • http://files.stephanieteresesimonmusic.com/uploads/1/3/1/3/131398360/4135744.pdf
    • http://files.earleduskey.com/uploads/1/3/1/3/131381602/piwimumitutuke_demavatuzokigu_nesinepagag.pdf
    • https://cdn.shopify.com/s/files/1/0431/2865/1938/files/2005_polaris_sportsman_500_ho.pdf
    • https://cdn.shopify.com/s/files/1/0427/7963/9967/files/kazexekowigifutopetazuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/4343/8244/files/acls_card.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/2500557594.pdf
    • https://cdn.shopify.com/s/files/1/0434/2772/5474/files/66415479200.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/229980893.pdf
    • https://cdn.shopify.com/s/files/1/0429/5308/0985/files/jinolenodudowuvon.pdf
    • https://cdn.shopify.com/s/files/1/0431/4637/9426/files/53363959747.pdf
    • https://cdn.shopify.com/s/files/1/0435/8068/6497/files/accounting_and_finance_terms_and_definitions.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8839/files/53744474380.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/7986008423.pdf
    • https://cdn.shopify.com/s/files/1/0433/4954/1013/files/treatment_of_meconium_aspiration_syndrome.pdf
    • https://cdn.shopify.com/s/files/1/0432/2381/0203/files/dopaxi.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_off0000e900.bin
7ffe0848049262402bc3114c44a6bdb94d4a553b0c9b5313f3ea183ffcecf8fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 5024 bytes
font_01_sfnt_off0000f9f5.bin
ff689131c218b594c180d052f38a6875e76dc0b8e365324a15ce7ac8d03d2146		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F5 13792 bytes

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