Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e9bc342d75c257…

MALICIOUS

PDF

49.2 KB Created: 2020-07-17 03:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1da67ecda9bf3e6fa89452993abb8eab SHA-1: 376a96d44e121aed0f09b1db35f05f1c285bc203 SHA-256: 09e9bc342d75c257c6ae646c18c76b6a774de9cdb98d8126e376505dfe9d835e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though heavily obfuscated, suggests a lure related to a 'book pdf free' search query. The presence of numerous external PDF links, many pointing to Shopify domains, indicates a link farm strategy, likely to improve search engine ranking for malicious content or to distribute further payloads.

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/wb?keyword=wayward%20son%20book%20pdf%20free
    • http://files.fhglory.org/uploads/1/3/1/4/131406286/9117427.pdf
    • http://files.huecohacienda.com/uploads/1/3/0/7/130740563/sidujumugetimilizig.pdf
    • http://files.counterpoint-journal.com/uploads/1/3/1/3/131398515/2576e7abec64f.pdf
    • http://files.pictonlittletheatre.com/uploads/1/3/1/4/131453402/nafasaxujofusaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2834/9079/files/83835001780.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3633/files/dovavapebuserodo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0965/5462/files/14348605507.pdf
    • https://cdn.shopify.com/s/files/1/0429/5681/6540/files/86754976581.pdf
    • https://cdn.shopify.com/s/files/1/0428/3806/5308/files/3327694369.pdf
    • https://dusinademix.files.wordpress.com/2020/07/suriziker.pdf
    • https://lavaleteme.files.wordpress.com/2020/07/vukinojeragumexojoja.pdf
    • https://zuporewa.files.wordpress.com/2020/06/77192560103.pdf
    • https://cdn.shopify.com/s/files/1/0431/5712/7336/files/21583111938.pdf
    • https://cdn.shopify.com/s/files/1/0430/2667/7913/files/32458417443.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/4107173541.pdf
    • https://cdn.shopify.com/s/files/1/0432/2187/6900/files/xidum.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/27169895195.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lujodegiduwidixerilaji.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/21431222298.pdf
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/lelalopabekovaxenamenedi.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_off000081dd.bin
8acecac7fb5d894af7a56db31f272a7bb68e7c00bdb22f2cc8ca3bdb47a37b5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81DD 5076 bytes
font_01_sfnt_off0000933e.bin
19b42517c515f0c829181292c4293d985790a0c1dc6e42be2dfefbdcc6a6fc2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x933E 10636 bytes

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