Malicious PDF — malware analysis report

Static analysis result for SHA-256 8333d9c73f1eea17…

MALICIOUS

PDF

43.2 KB Created: 2020-08-31 18:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b28ac978db8884931c3049bd2fe3e33 SHA-1: f592a477f2d2cede02d0583dc7398389960d6eed SHA-256: 8333d9c73f1eea171e3eed9e274801d292500dc74f26e4153dd63b5bd3c11229
154 Risk Score

Malware Insights

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

The PDF contains embedded links and a URL in its body text that point to a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier strongly indicates maliciousness. The document's content, despite being heavily obfuscated, appears to be a lure for educational material, likely to trick users into clicking the malicious link.

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.me/wix?keyword=conjugating+ir+verbs+in+french+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/d1c05f_6b238cc6b55a4bc3bfa6a8b6d79d4fec.pdf
    • https://static.usrfiles.com/ugd/d1d005_22b02eafd1284346baa4d5ff7daec196.pdf
    • https://static.usrfiles.com/ugd/b8c837_b20c93d4ea154df0a77c5ec43467059e.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_7aabe2fdfdc9410abc8ca5288db013f3.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/epic_seven_great_farche_labyrinth_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90841244024.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kuvesagapixunijibofalase.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/veterinary_infectious_diseases.pdf
    • https://cdn.shopify.com/s/files/1/0437/9269/5456/files/38708064822.pdf
    • https://cdn.shopify.com/s/files/1/0465/1519/1958/files/dizisupiratarevog.pdf
    • https://cdn.shopify.com/s/files/1/0440/8036/5720/files/56758992059.pdf
    • https://static.usrfiles.com/ugd/b8c837_684aa52f1b41443ca46dc2677abb7ac2.pdf
    • https://static.usrfiles.com/ugd/2b3f46_e7a6c0cdf2064d659618b805ce7421c1.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_9fc5b6e4fdc64825b259ac32caf8bfa6.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000541b.bin
952305badff959a8421f6801bee2b343b23248fa8ae91c71db5d8293707072ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x541B 5448 bytes
font_01_sfnt_off000066c1.bin
6e935338d156501b513e988f95e88ceb688f1707b21a47b2fd1cd123d62a7d01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66C1 13784 bytes
font_02_sfnt_off00009211.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9211 4324 bytes

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