Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7149701c97214a…

MALICIOUS

PDF

39.3 KB Created: 2020-08-06 06:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f783f67e826f807d0da806bd19f0090 SHA-1: 7b283b62934f847b667c52db0b5ccb31e88844b8 SHA-256: 7b7149701c97214a8ae1031afc01633ab447f407d771d152ad7bab3831e0ef71
154 Risk Score

Malware Insights

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

The PDF document contains a lure related to 'English phonics books pdf' and embeds numerous links, including one to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

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=english+phonics+books+pdf
    • http://files.gretchenjude.com/uploads/1/3/1/3/131398075/5790187.pdf
    • http://files.bcwine.ca/uploads/1/3/1/4/131438313/fb8752bc8c268e.pdf
    • http://files.msdioriosapclassroom.com/uploads/1/3/0/7/130740262/5833efcff8bb78c.pdf
    • http://files.independencetelevision.com/uploads/1/3/1/6/131606640/1938335.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6337/8081/files/fagupakesijivoz.pdf
    • https://cdn.shopify.com/s/files/1/0445/6900/2143/files/wupujarirezuwivosa.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/47463629224.pdf
    • https://cdn.shopify.com/s/files/1/0431/5188/4445/files/xakepijezeradegojipe.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/xojimexudarewafew.pdf
    • https://cdn.shopify.com/s/files/1/0437/0608/9640/files/stokstad_art_history.pdf
    • https://cdn.shopify.com/s/files/1/0432/9416/3109/files/tuvosiwixapirupikagim.pdf
    • https://cdn.shopify.com/s/files/1/0431/8917/4432/files/dalogimawaregis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xizujebekox.pdf
    • https://cdn.shopify.com/s/files/1/0435/2399/7856/files/pamanukizasodofovivi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3259/8938/files/spring_batch_tutorial_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0436/3547/4590/files/gazodomareralemudoba.pdf
    • https://cdn.shopify.com/s/files/1/0431/4464/2716/files/norton_360_trials.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_off00005c7a.bin
33afb77ed2f5cb4f81c54cba109da7e095ec0fb91c8e7274ebd743615c382105		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C7A 5272 bytes
font_01_sfnt_off00006e72.bin
c7984847e5fc4c230f902455764f77542e5a8deea6d928a2b0a9760552efe960		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E72 9884 bytes

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