Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4499c42f1358b51…

MALICIOUS

PDF

43.1 KB Created: 2020-08-03 03:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12a36e3cdac347c1a590655e30027e74 SHA-1: 604f8a9ed53abee23f2667af33ea1730a44e4150 SHA-256: c4499c42f1358b51f76ea1048018880aa9057a707e81d26ec6d4b688eab1cacd
152 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with the primary link pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated text containing the malicious URL and other links, likely intended to lure users into clicking through to a compromised site.

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.ru/pify?keyword=supersucc%252C+hp9btjuftp6pkm%252C+0%252C%255B%252A%252A%252A%252A%252A%252A%252A%252A%252A%252A%252A%252A%252A%252A%252A%252A%252C%252A%252A%252A%252A%252A%252A%252A%252A%252A%252C+%252C+null%252C+generic%255D%255D%255D
    • http://files.cardconnectnetwork.com/uploads/1/3/1/4/131406649/gufaxaf-jivimakubag.pdf
    • http://files.healthandwellnessforum.org/uploads/1/3/1/8/131857782/febodiniwuk_tadeseziguke_kaponirigusezo.pdf
    • http://files.thelegendofauferre.com/uploads/1/3/1/8/131856725/puxeneti.pdf
    • http://files.crossingbridgescoaching.com/uploads/1/3/1/6/131606486/xobagub_weguvevoz_domimabuj_dujonapad.pdf
    • http://files.luminstruct.com/uploads/1/3/2/6/132695519/gorefezeb-bewoxabozufan.pdf
    • https://cdn.shopify.com/s/files/1/0431/6889/1040/files/51195927714.pdf
    • https://cdn.shopify.com/s/files/1/0439/2599/5688/files/remington_speedmaster_241_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/8921/6167/files/sukiguruj.pdf
    • https://cdn.shopify.com/s/files/1/0431/8022/8759/files/az_mvd_revocation_packet.pdf
    • https://cdn.shopify.com/s/files/1/0435/8710/9023/files/jewaravulalurej.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8263/files/xegalino.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5321/files/ceat_engine_5._6._1.pdf
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/6494906246.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/29878061118.pdf
    • https://cdn.shopify.com/s/files/1/0436/2141/7122/files/susizelim.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065e3.bin
c6c2810ee145aec70e0cf1101557f96227750070cb13561487fae06f8e56a02f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E3 6264 bytes
font_01_sfnt_off00007b36.bin
c7e2b6c30ca6a3580e0756bfeed35d70417d2851f68f699ad805a5392b7025b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B36 10332 bytes

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