Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6a994c8ba06403…

MALICIOUS

PDF

63.3 KB Created: 2020-10-29 10:48:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3dbccdf3bd8e9fb4491b9304b5b101b5 SHA-1: 14c76710cbccb24784fc2d7d725ead493691f354 SHA-256: aa6a994c8ba064033cb49ad8a5c6c608d3bddf72fec7c65a2656f7b91bf92477
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, disguised with text suggesting educational content. The ML classifier strongly indicated maliciousness. The embedded URLs suggest the document is part of a link farm designed to drive traffic to malicious sites, likely for phishing or malware distribution.

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/123?keyword=paramedic+math+practice
    • https://cdn-cms.f-static.net/uploads/4391335/normal_5f8ddebc85a5d.pdf
    • https://gizojobov.weebly.com/uploads/1/3/4/4/134436228/nogexezutusixof.pdf
    • https://pefuxagofir.weebly.com/uploads/1/3/4/3/134359429/5171287.pdf
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/rotito.pdf
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/besosuror.pdf
    • https://xewebetolibas.weebly.com/uploads/1/3/4/3/134372476/5c15d536.pdf
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5f8ee6c74d6a0.pdf
    • https://cdn-cms.f-static.net/uploads/4416331/normal_5f9993e6d1236.pdf
    • https://rubazepenomul.weebly.com/uploads/1/3/4/3/134324915/5933015.pdf
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/6c71955787.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0504/9001/5904/files/wogigafubixiteganoj.pdf
    • https://s3.amazonaws.com/vifusupegiza/compliance_audit_manual.pdf
    • https://cdn.shopify.com/s/files/1/0503/7244/4328/files/best_guitar_chord_app_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0484/0298/9208/files/clipsal_classic_2020.pdf
    • https://cdn.shopify.com/s/files/1/0484/4027/9205/files/26267099565.pdf
    • https://cdn.shopify.com/s/files/1/0498/1247/1962/files/atkins_carb_tracker_app_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0502/0162/4727/files/12742347011.pdf
    • https://s3.amazonaws.com/bulikowexunepov/gre_issue_and_argument_essays.pdf
    • https://cdn.shopify.com/s/files/1/0484/1150/8904/files/tenom.pdf
    • https://cdn.shopify.com/s/files/1/0485/9314/1925/files/corrente_eletrica_em.pdf
    • https://cdn.shopify.com/s/files/1/0433/5471/8358/files/75549058508.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a324.bin
19a5345076a0b3e046bfecbd710b776f72a561413fd358d24dbe23847d76c802		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA324 5104 bytes
font_01_sfnt_off0000b452.bin
cf91896764406bf8759516bb445da2013b3fe4066ae7226f7e536f13394474d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB452 11448 bytes
font_02_sfnt_off0000daaa.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAA 16204 bytes

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