Malicious PDF — malware analysis report

Static analysis result for SHA-256 8824c1f5f116b813…

MALICIOUS

PDF

42.0 KB Created: 2020-08-08 18:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cbbb689cd30789430de12af0b0d04e5 SHA-1: fe91227be9efbfae612110eef75c44e96c1b7ebc SHA-256: 8824c1f5f116b81328697197b56a0475ea40f0404ddda9e36e7bc1b35cc37e43
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, indicating an attempt to lead the user to malicious content. The document body, though heavily obfuscated, contains text suggesting a lure related to 'Anita Herbert free pdf'. The presence of numerous external PDF links, many pointing to Shopify, suggests a link farm or SEO manipulation tactic to distribute the malicious PDF. The ML classifier also strongly flagged this PDF as malicious.

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=anita+herbert+free+pdf
    • http://files.littlebobtailresort.com/uploads/1/3/0/7/130776407/3179864.pdf
    • http://files.leslienagel.com/uploads/1/3/1/4/131437012/dukavagexovuj-fofofux-moneziw-vikefad.pdf
    • http://files.ballisticstrength.ca/uploads/1/3/1/4/131407178/a6a08283b7756d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5323/6902/files/wevusenilumogegero.pdf
    • https://cdn.shopify.com/s/files/1/0435/3196/0474/files/lodixobesakoluketokoza.pdf
    • https://cdn.shopify.com/s/files/1/0431/7125/0333/files/36231235533.pdf
    • https://cdn.shopify.com/s/files/1/0437/6068/1109/files/audi_mmi_update.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fedixudarat.pdf
    • https://cdn.shopify.com/s/files/1/0434/0806/4677/files/steps_of_curriculum_development_process.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/17584944792.pdf
    • https://cdn.shopify.com/s/files/1/0435/5381/6728/files/xidifuwurepusujizu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2638/9912/files/jtable_netbeans_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/navizuriromikofade.pdf
    • https://cdn.shopify.com/s/files/1/0432/1984/5278/files/estratgias_de_marketing_digital_e_e_commerce_sandra_turchi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/nijabitaponagi.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_off0000659d.bin
40f556b3078e24b3118f9013ed6981740c951995affe7a867d5a4d1467da38b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x659D 5048 bytes
font_01_sfnt_off000076bf.bin
b0322dc134f54bac5ce7ce27add3c58a32297ab19aec8f79bea2a98bb4ecce47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76BF 10672 bytes

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