Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb9208c5615206a…

MALICIOUS

PDF

39.1 KB Created: 2020-09-03 18:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29b0dc40284a996830f00b746d5c9979 SHA-1: 231472de7db40e39f58b7b3f8713ba6b8c67d362 SHA-256: 3bb9208c5615206ad9ea5fc21268ab06e3ebfaf7323b6c55f867d81f39896fad
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, with one identified as a malicious redirector. The document body, though obfuscated, contains text related to a 'volume of a rectangular solid worksheet' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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.club/wix?keyword=volume+of+a+rectangular+solid+worksheet
    • https://static.usrfiles.com/ugd/3bcfef_28f3acb4f557476c98971d76a50b2825.pdf
    • https://static.usrfiles.com/ugd/f63f29_e7723ebbbe194efeb55f3cb3d051cb50.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9e49ccab4d2473b92c51524267b7cea.pdf
    • https://static.usrfiles.com/ugd/a421e3_3d317438aca445778a9a39547e1014ca.pdf
    • https://static.usrfiles.com/ugd/a4e402_fd784d8c9072404a9d091da4953045f1.pdf
    • https://cdn.shopify.com/s/files/1/0427/8291/6767/files/35818889478.pdf
    • https://cdn.shopify.com/s/files/1/0437/6815/2216/files/36135081434.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4280/files/60911218456.pdf
    • https://cdn.shopify.com/s/files/1/0430/9634/2695/files/92521275104.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0210/files/chinese_calligraphy_practice_paper_p.pdf
    • https://static.usrfiles.com/ugd/de65f7_35a951aac4ab432c942a453aefef243d.pdf
    • https://static.usrfiles.com/ugd/f90bad_d1af3a7f3bc846f1be860bbff0eca0e2.pdf
    • https://cdn.shopify.com/s/files/1/0431/0836/8545/files/84962840782.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5511/files/5654892470.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/html_formatter_vscode.pdf
    • https://cdn.shopify.com/s/files/1/0435/6148/4437/files/app_new_format_2019.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/degopo.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_off00004c16.bin
ca3e55e570a36d970b6f1b61ba81ab86b33f617a15affa54257625c5c54d1878		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C16 5436 bytes
font_01_sfnt_off00005e7b.bin
e982b36a59cac1306973ee459980ef3e5d669c72dbfc3435b0d38dcee7a98a16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7B 9656 bytes
font_02_sfnt_off00007f88.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F88 4324 bytes

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