Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c76781cbcafde6d…

MALICIOUS

PDF

36.1 KB Created: 2020-07-09 20:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efd3fb5fe999f980c0250e8209805119 SHA-1: 1aaef859bd44c04a57d49a4e12536d7ac206e04e SHA-256: 6c76781cbcafde6da276a8e2d2ef6860cae774b673e3cb1b0c6edffc1dd9c786
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically identified as a malicious redirector. The document body, though obfuscated, suggests a lure related to 'Babydan playpen instructions manual' to encourage users to click the malicious link. The ML classifier strongly indicated maliciousness, and the presence of a redirector link points to an attempt to lead the user to a malicious 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.com/wb?keyword=babydan%20playpen%20instructions%20manual
    • http://files.firstbaptistmartinsville.com/uploads/1/3/1/1/131164472/daropiworetabel_depewat_misurufurumuw_wedelujimoruj.pdf
    • http://files.5ivezero.com/uploads/1/3/1/4/131437538/boxuzuzege-jamov-susaxozokusonir.pdf
    • http://files.firstathens.org/uploads/1/3/2/7/132710687/9347935.pdf
    • http://files.exclusivepet.net/uploads/1/3/0/7/130739503/zolipolawuzuw.pdf
    • http://files.studio-lady.com/uploads/1/3/1/8/131856844/dewedefawo_zagokirenepuson_penalu_kofibaxi.pdf
    • http://files.okeedrive.co.uk/uploads/1/3/1/3/131379434/164616.pdf
    • http://files.offthehookkiteboarding.com/uploads/1/3/2/6/132681970/japijawo.pdf
    • http://files.sidleystandup.com/uploads/1/3/0/7/130775942/3089407.pdf
    • http://files.drjasonwilliams.com/uploads/1/3/0/8/130873741/jabijesugumavo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://patodulamup.files.wordpress.com/2020/06/temubis.pdf
    • https://zijolaraf.files.wordpress.com/2020/07/ruluzejiwinorikajelisufo.pdf
    • https://xekomuzow.files.wordpress.com/2020/06/7589955278.pdf
    • https://wisowewemuj.files.wordpress.com/2020/07/gurirajetev.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pegumi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/48787523288.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovovowegafakaroseras.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47878122177.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_off000050c0.bin
ebf46ee896865cd9046af05b4fece868afa57e6f0bd090acbf7286ca5913fcf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50C0 5392 bytes
font_01_sfnt_off000062f0.bin
6df6d429bb29f6513cf194f9d837a9f2113747fd5ea5de3178f113dda3c763b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F0 9672 bytes

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