Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eeab219df7cf1b4…

MALICIOUS

PDF

105.7 KB Created: 2020-09-29 19:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7fc6722f55f89fbf8e283b13b5d18eb SHA-1: df4ff3c918538e6e9a055651e6c810086166fad0 SHA-256: 4eeab219df7cf1b4b9aa2b982a16103121aa8383c8b41e80cff0557114aab73a
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://cctraff.ru/strik?keyword=itil+foundation+itil+4+edition+axelos+pdf'. This URL is embedded within the document body, suggesting an attempt to trick the user into clicking it. The presence of a large number of external PDF links also indicates a link farm, likely for SEO poisoning or to obscure the malicious destination. 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://cctraff.ru/strik?keyword=itil+foundation+itil+4+edition+axelos+pdf
    • http://files.srilanka-explorer.net/uploads/1/3/2/7/132710563/gaxuda.pdf
    • http://widetoxo.911bodyresq.com/uploads/1/3/0/7/130738755/9651088.pdf
    • http://files.jordanthariel.com/uploads/1/3/1/3/131383283/fcd9cd793655.pdf
    • http://files.gchumsoc.org/uploads/1/3/0/7/130775747/f03d2fa.pdf
    • http://files.mrball.org/uploads/1/3/2/8/132814906/8685016.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92702877098.pdf
    • https://cdn.shopify.com/s/files/1/0430/0842/6143/files/xibugipopodet.pdf
    • https://cdn.shopify.com/s/files/1/0462/0055/3635/files/the_worlds_easiest_game_ever_unblocked.pdf
    • https://cdn.shopify.com/s/files/1/0438/3476/9565/files/96862803469.pdf
    • https://cdn.shopify.com/s/files/1/0432/5215/4532/files/xoninam.pdf
    • https://uploads.strikinglycdn.com/files/4b325518-642e-4a5c-ae79-43a3eefe461c/20196000385.pdf
    • https://uploads.strikinglycdn.com/files/88cf15da-47d5-4ee2-942a-b39ba1fd8e67/wisaxisitutafovasaluwuw.pdf
    • https://uploads.strikinglycdn.com/files/7aab504f-f019-4f6a-b819-e3f01f7867da/sufopasa.pdf
    • https://uploads.strikinglycdn.com/files/c11d9358-fdb6-4e1d-abe9-9dc65c78c6be/64926396553.pdf
    • https://uploads.strikinglycdn.com/files/5515e973-fc00-459a-84c4-8e574a9f16a1/jiwisugabinopowaj.pdf
    • https://uploads.strikinglycdn.com/files/49fd8971-9b07-4b68-ba5f-6d4111c38b7e/99196120299.pdf
    • https://uploads.strikinglycdn.com/files/080b001b-8101-4600-afc4-9c0dae8e2604/jivasafenuredebepatujofe.pdf
    • https://uploads.strikinglycdn.com/files/036c8f58-350f-47bf-9e4e-457629e10071/fupaxelonopadewilokanuse.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_off000146be.bin
c3e8ab9ae75c452bbe757629ddb26551e2bb51cea8064a1e69502572e3968331		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146BE 4912 bytes
font_01_sfnt_off0001578d.bin
51b4eb5a66e795e0fdd741b48cd92b2009bdaca537c42da5dc92849dffd7ce94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1578D 15780 bytes
font_02_sfnt_off0001886e.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1886E 4324 bytes

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