Malicious PDF — malware analysis report

Static analysis result for SHA-256 020b5366ffb4b454…

MALICIOUS

PDF

71.5 KB Created: 2020-08-30 21:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a077747c13fb404f72b0ded28ad927cf SHA-1: 7705ecf027c9bdf36d52c69b53d9a0f506183606 SHA-256: 020b5366ffb4b454a1a45b3c5b6acc480a3d643fb3364a83fff6b3baf7608786
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is designed to lead users to malicious content. The document body, though heavily obfuscated, contains text related to 'Maplestory reboot kinesis guide' and a URL that appears to be part of a link farm, suggesting a phishing or scam attempt. The ML classifier strongly indicates 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.cc/wix?keyword=maplestory+reboot+kinesis+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/8786/9592/files/30759608966.pdf
    • https://cdn.shopify.com/s/files/1/0430/6698/2561/files/sazutinugizuxeponowujexe.pdf
    • https://cdn.shopify.com/s/files/1/0430/5590/6973/files/synonyms_antonyms_homonyms_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0436/0319/8114/files/werewolf_game_cards.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77160317291.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf741a8d945f49c5a699f7df45f2abdf.pdf
    • https://static.usrfiles.com/ugd/b916f4_38ed866c902a4704acbc2e6563d327de.pdf
    • https://static.usrfiles.com/ugd/930050_49d4ea3b8f7141cab323b5f431963f37.pdf
    • https://static.usrfiles.com/ugd/0df15e_ecb89e1e04a54b52863e823df84cdd06.pdf
    • https://static.usrfiles.com/ugd/affb4a_8c3b9d135ec64be382f3a6bf3345cc08.pdf
    • https://static.usrfiles.com/ugd/cafc24_ff16a3f63e104f148ac70536ac39834b.pdf
    • https://static.usrfiles.com/ugd/b8c837_617fdbd2671548e68497e571a57e0c68.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_ed5f7895eeb147a6a265f6b63bc8891b.pdf
    • https://static.usrfiles.com/ugd/e4ff69_e634df809e944abb859de56b18bb3592.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a9b832ce99c473fb8a95568f8a7f68f.pdf
    • https://static.usrfiles.com/ugd/b8c837_88df5c8725814e8daedac952781e8b81.pdf
    • https://static.usrfiles.com/ugd/37321e_e57b184d2aa14aae853175328e9a6991.pdf
    • https://static.usrfiles.com/ugd/5ed537_1df7bd3af6e34b8b89a7504b3ee0c51a.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_off0000c957.bin
8b51dac8adab794869a9cc00527b276ff014ef297dfede02a9bed02015de5d7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC957 3784 bytes
font_01_sfnt_off0000d6f3.bin
6e9daa4f72fccf26d360a904ebfa3b9d106275b92c8acf22bf6032e2ea338141		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F3 5440 bytes
font_02_sfnt_off0000e98a.bin
a5bd350bf51d552807cda812d5b2f3662896aa14b980a5b07c84fed481f1f612		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE98A 11708 bytes

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