Malicious PDF — malware analysis report

Static analysis result for SHA-256 1887793f1ec43d96…

MALICIOUS

PDF

42.9 KB Created: 2020-08-02 09:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3fea1a2b64dc45c92b262e0e0676246 SHA-1: ae7aeec1dcfeea25e6dacdb6da087415b45ce2aa SHA-256: 1887793f1ec43d96fbb773583d8635e7e354b32b30b7fdab349a5e305a205da6
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'calculus early transcendentals 11th edition pdf download' lure, and the primary malicious URL is associated with this lure. The heuristic firings indicate the PDF is designed to redirect users to malicious infrastructure, likely as part of a phishing or scam campaign.

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=calculus+early+transcendentals+11th+edition+pdf+download
    • http://files.darrenmayner.com/uploads/1/3/0/7/130738825/5848629.pdf
    • http://files.myreasonwhy.net/uploads/1/3/1/4/131453401/jidigubude.pdf
    • http://files.urbancultureinstitute.org/uploads/1/3/1/4/131453850/tomeruvobe_jefurilojogiba_gazufofifiteri_bigajumobitivi.pdf
    • http://files.vanambergrealty.com/uploads/1/3/1/8/131871699/6689477.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/awolnation_i_am_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0433/6045/2760/files/tiwitetejadebepexa.pdf
    • https://cdn.shopify.com/s/files/1/0433/4649/3605/files/37898667936.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wijabogose.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/15138334831.pdf
    • https://cdn.shopify.com/s/files/1/0430/3886/7607/files/7779759371.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/rinonumogepoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/3262/4797/files/27145670275.pdf
    • https://cdn.shopify.com/s/files/1/0431/2386/7805/files/namuwov.pdf
    • https://cdn.shopify.com/s/files/1/0438/0740/8290/files/77039026236.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5754/files/bikulexonerotizunamotapap.pdf
    • https://cdn.shopify.com/s/files/1/0430/6770/3450/files/79666681979.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/dubuxelatud.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_off0000685a.bin
dac26ef11e14f90cbc108c9da6543699b276f7d58ee6903cec5e2a5139594f09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x685A 5392 bytes
font_01_sfnt_off00007ac5.bin
ced411ec7d0d45e72ad32c06ef9249113c4f61691b0b4949cd8a275af626a687		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC5 10420 bytes

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