Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ca41fd29d04b45…

MALICIOUS

PDF

48.1 KB Created: 2020-08-02 09:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc7f2b8322aa7daa8c47beb504772244 SHA-1: 3f94f9c3da30d711846516449b7f63bd09062dfc SHA-256: 10ca41fd29d04b45d21a4e539ab1c32e5f8c0c4f84f7c6122f7be0e197f7aa58
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of these links, 'https://ttraff.com/pify?keyword=best+heroes+for+cursed+hollow', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs, suggesting an attempt to direct the user to external content.

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=best+heroes+for+cursed+hollow
    • http://files.saverahwaypark.org/uploads/1/3/0/7/130740563/pilomege.pdf
    • http://files.crossroadschurchvt.org/uploads/1/3/1/3/131379591/vakaxazote.pdf
    • http://files.greatwhytesurfboards.com/uploads/1/3/0/7/130775320/dcf98a6b3de9549.pdf
    • http://files.ollingerconsulting.com/uploads/1/3/1/6/131606280/f021f0d4f7d.pdf
    • http://files.christinetayloronline.com/uploads/1/3/0/7/130775310/807265.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/12488333281.pdf
    • https://cdn.shopify.com/s/files/1/0438/3241/0272/files/ge_dishwasher_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/0744/2072/files/tasutokurupi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8917/4432/files/fejugizasi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5892/9570/files/63550969398.pdf
    • https://cdn.shopify.com/s/files/1/0432/4671/5040/files/54105231731.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/96901449204.pdf
    • https://cdn.shopify.com/s/files/1/0437/6444/9431/files/63931975065.pdf
    • https://cdn.shopify.com/s/files/1/0433/6582/6719/files/67466670934.pdf
    • https://cdn.shopify.com/s/files/1/0429/3741/7891/files/wekawuzafu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/review_on_bovine_mastitis_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/wemem.pdf
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/11371986517.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_off00007f32.bin
d7ac9e1f927d608df876dc719c384ee83fe591e53b57b991d2b09e5e8b6503f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F32 5040 bytes
font_01_sfnt_off0000906d.bin
d6e9885192da1160681437d6c9b4ee2b7cfb0c312b925f014163a9f1285c5fc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x906D 10204 bytes

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