Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e063ba8763865ba…

MALICIOUS

PDF

36.5 KB Created: 2020-08-31 16:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d9a99f2f4e1c1ec2855cdeac878ca08 SHA-1: 081be93f8fa0a5a6c95081c07242b8faf4338999 SHA-256: 6e063ba8763865ba6204f9122495af87351d67ac8e68b1f120495e9c8c08b873
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though corrupted, contains text suggesting it is disguised as educational material ('Quantifiers worksheets grade 4') and includes the malicious URL, indicating a phishing or redirection attempt.

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/pify?keyword=quantifiers+worksheets+grade+4
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_b0045a5acf644ecd8e81c7dd61163492.pdf
    • https://static.usrfiles.com/ugd/93971e_346ed0dc47a4415b931bd066fda7996d.pdf
    • https://static.usrfiles.com/ugd/12daa7_a95368f3a73349cb95e247d867a8bc35.pdf
    • https://cdn.shopify.com/s/files/1/0431/0496/0661/files/55786108261.pdf
    • https://cdn.shopify.com/s/files/1/0429/1428/3686/files/36888705152.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6918/files/93488049885.pdf
    • https://cdn.shopify.com/s/files/1/0430/9434/3834/files/multistage_amplifier_design.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8a828d5db344b34b4a16364c9714aa7.pdf
    • https://static.usrfiles.com/ugd/04c368_bf930852185c4121acfa3256cd014320.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051bc.bin
5f07c2c0629a5d72587b55a3a3e39208d9869c7a449c233afbbcc01ed8ecfbbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51BC 5444 bytes
font_01_sfnt_off00006457.bin
0665b21aaaa63024c6c01adc5246d085da6a7ff3f12e886c7e5930fb1a419396		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6457 9836 bytes

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