Malicious PDF — malware analysis report

Static analysis result for SHA-256 183253755a3ed731…

MALICIOUS

PDF

45.4 KB Created: 2020-08-02 19:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a66d6190db31857709e053e4a9bac03 SHA-1: 3ca365873dcbcb96f7378c99daa0f91b9ea7abfb SHA-256: 183253755a3ed7312191acfafacd402ad4a1e57a23075234b271335b856d8fe1
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links, including one pointing to a known malicious redirector, and exhibits characteristics of an advance-fee scam lure. The document body, though partially corrupted, suggests a "study guide answers" pretext to encourage link clicks. The presence of multiple embedded links to external PDFs, many hosted on Shopify, indicates a link farm designed to obscure the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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/pify?keyword=issa+workbook+and+study+guide+answers
    • http://files.himalayanadventures.net/uploads/1/3/2/6/132681880/4915522.pdf
    • http://files.laurasaye.com/uploads/1/3/2/6/132682076/datet_bebod_xagobutafele_xuratep.pdf
    • http://files.handsofhopegallup.org/uploads/1/3/1/4/131414743/d0e36.pdf
    • http://files.cforcesystemssolution.com/uploads/1/3/0/7/130776204/43d935.pdf
    • http://files.wynwhisper.com/uploads/1/3/1/0/131070611/xekedobopizoxoj_zasipop_bezomana_minivigosovilur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/74745500503.pdf
    • https://cdn.shopify.com/s/files/1/0432/7335/5419/files/jebivazamokokitisijadezo.pdf
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/94426332329.pdf
    • https://cdn.shopify.com/s/files/1/0449/5455/0440/files/berger_reloading_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sotuxinonuwirumedubisaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/32690992274.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/39086675177.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/lirejoxesefemirit.pdf
    • https://cdn.shopify.com/s/files/1/0432/1122/7300/files/jawirujata.pdf
    • https://cdn.shopify.com/s/files/1/0433/4324/9563/files/29167169223.pdf
    • https://cdn.shopify.com/s/files/1/0428/5543/2348/files/piwifezekobipamamage.pdf
    • https://cdn.shopify.com/s/files/1/0433/2827/4585/files/mivemawutak.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_off000071eb.bin
c452ac00603778aa6bfcaf79ee060ca33e0da78ea6c14e2df540ce19aac7e377		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71EB 5296 bytes
font_01_sfnt_off0000841a.bin
2c300772f4b86ac2a41604f81b78e79ddb4432f2542bacb0f1e34aa7683b4fe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x841A 10668 bytes

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