Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9e138402f79fee…

MALICIOUS

PDF

49.1 KB Created: 2020-08-13 11:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf65348bd348c61d2e1e6fb1798e2910 SHA-1: 9c36f8b7bb0bd576afcddd1b1d98227d21f1e602 SHA-256: db9e138402f79fee556ec96a13c960adc8fb65a3b5dda6bf034b53da3985f238
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to `ttraff.com`, which is identified as malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same search query as the malicious URL, suggesting a lure for users searching for specific documents. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=supply%20chain%20management%20short%20notes%20pdf
    • http://vewez.giocosonl.com/uploads/1/3/0/7/130775350/wobenati.pdf
    • http://getibe.pmrfirstthirdresources.ca/uploads/1/3/1/1/131163635/polagukiwejivo-karusumines-wikofitevilav.pdf
    • http://files.sahiphopawards.com/uploads/1/3/2/6/132681749/danogowewofodubulu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8049/9879/files/sajedipuk.pdf
    • https://cdn.shopify.com/s/files/1/0448/1299/2674/files/jolly_phonics_worksheets_printables.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/cctv_camera_training_course.pdf
    • https://cdn.shopify.com/s/files/1/0432/5824/9380/files/bivipolanotelavawo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/44854249854.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90685913575.pdf
    • https://cdn.shopify.com/s/files/1/0438/1789/4050/files/beading_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0434/3427/9062/files/fogomesulilabatamubite.pdf
    • https://cdn.shopify.com/s/files/1/0429/7755/8681/files/luvurumiwibozas.pdf
    • https://cdn.shopify.com/s/files/1/0439/1639/4648/files/40491161044.pdf
    • https://cdn.shopify.com/s/files/1/0428/7266/8319/files/gewedopu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0016/7589/files/94854645607.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tijubijevuvikupox.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zosakasebiribo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6933/files/xedigodapar.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072b4.bin
198ace557659bba3f4a3716f3120fb9d08ea1923e7221d7a3923cd8e88d7842a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72B4 5656 bytes
font_01_sfnt_off000085bd.bin
594f48baac53a3de85fb0fbeceb6d510fe59957f6399e8bedd58efeff8f56320		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85BD 10568 bytes
font_02_sfnt_off0000a90f.bin
781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA90F 4324 bytes

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