Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67fae3e8aa3f01f…

MALICIOUS

PDF

39.9 KB Created: 2020-08-08 09:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 138a6edc2de3ed81617ef7ed05b05305 SHA-1: 5f55b137e3ce482ad09a1da8585f07fa9002e913 SHA-256: c67fae3e8aa3f01f611fb87376fabd0e8d00a3b5337336c7fe727bdc26d905a3
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, designed to create a link farm. One prominent link, 'https://ttraff.com/pify?keyword=price+ceiling+and+price+floor+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect users to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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=price+ceiling+and+price+floor+pdf
    • http://files.snow-channel.com/uploads/1/3/1/0/131070560/7143438.pdf
    • http://files.broadmoorpresbyterian.org/uploads/1/3/0/7/130739718/nupidoba-zutesasif-konibezus.pdf
    • http://files.raiareads.com/uploads/1/3/0/9/130969065/supawarezo-gijijiwi-toguwusurovobid-tededefa.pdf
    • http://files.flo-kelvinfreelance.com/uploads/1/3/0/9/130969012/4acb77141.pdf
    • https://cdn.shopify.com/s/files/1/0434/2166/3397/files/kanamupixidanokovo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/37848630580.pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2623/files/ribofoxezavudutafelud.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/download_video_from_m3u8.pdf
    • https://cdn.shopify.com/s/files/1/0430/2739/8807/files/movoboxuxotigerukewidenal.pdf
    • https://cdn.shopify.com/s/files/1/0430/9919/3501/files/zadegux.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3590/files/skyrim_mod_load_order.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7741/files/salesforce_community_developer_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/7937/6798/files/70257415333.pdf
    • https://cdn.shopify.com/s/files/1/0438/0029/7633/files/form_simplicity_arkansas.pdf
    • https://cdn.shopify.com/s/files/1/0437/6874/2039/files/45104259079.pdf
    • https://cdn.shopify.com/s/files/1/0433/4151/2855/files/55263990191.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_off00005e33.bin
be5cd423301a4fdb9d9b9825c442779da3a5762acf8f87151072362b137acc94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E33 5148 bytes
font_01_sfnt_off00006fc5.bin
d47e6df655e753180f3e891611eeec65fcc7bd1970c7a866c51e466090444d07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC5 10360 bytes

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