Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee6d03373387dc1e…

MALICIOUS

PDF

64.6 KB Created: 2020-08-22 00:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3c90b8eb284e89ed8b035a78dea4ce5 SHA-1: 22327c8d096beef9a9a245a417529ae9dfd98348 SHA-256: ee6d03373387dc1e46d04a0ae56d2556bad169b51ef246a69978a7496479653a
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URL points to a redirector service, which is likely used to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the URL that triggered the redirector heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=malayalam+movies+2018
    • http://botufa.saipanprivateschool.com/uploads/1/3/0/7/130775164/nunifavumusojakubok.pdf
    • http://files.revivenetwork.co.uk/uploads/1/3/0/9/130969654/totamepaw-kepotobasotonuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/6495/0945/files/74342159371.pdf
    • https://cdn.shopify.com/s/files/1/0430/7789/4293/files/6294052834.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/17269338802.pdf
    • https://cdn.shopify.com/s/files/1/0436/2603/7411/files/prolactinoma_in_pregnancy_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0434/1586/3452/files/17870531805.pdf
    • https://cdn.shopify.com/s/files/1/0432/3731/0632/files/jogifisajareru.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/14376167628.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/74199849921.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/azar_english_grammar_basic.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/petirigalobozajaxuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/tewepajifasizuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/8640/5022/files/burger_king_coupons_juli_2020.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
stream_004_off0000b5c7.bin
25b3798789b74971a638bcc6bc4762a5243148d8c07d2ba382e81d7b89e47df7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB5C7 8020 bytes
font_00_sfnt_off0000a357.bin
c1cafe510c96c79e57012c826609d28daecdcdb200b1d501480eb8bd0daa6719		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA357 5424 bytes
font_02_sfnt_off0000d1ea.bin
f42a7749a017517f55474b961784cd6cf7fe83e0650be2d90221432568c267a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EA 10396 bytes

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