Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7447a7f9dd8e78…

MALICIOUS

PDF

46.3 KB Created: 2020-08-14 02:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0139e4d096473f13db516c2e3a48aad4 SHA-1: 84d0e690ded4a99873aa0a1e1ca3fabc433d6e98 SHA-256: 7e7447a7f9dd8e788abc2edaeb7d907e2943a986a3b9c464351dc2a021b91271
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the target URL and other Shopify links, suggesting a link farm or SEO spam tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of embedded URLs and the redirector link are 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.com/pify?keyword=naive+set+theory+halmos+pdf
    • http://files.thegreenthumbgardens.com/uploads/1/3/2/7/132740291/jikepafolarakav.pdf
    • http://bilirer.cindysasso.com/uploads/1/3/1/4/131407552/2650325.pdf
    • http://files.catalyst-now.com/uploads/1/3/1/0/131070527/sizodu.pdf
    • http://zenof.robbenoptics.com/uploads/1/3/2/7/132740214/mezorunuvev_sapakikuxi_pimonatonel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8126/1466/files/pernkopf_topographic_anatomy_of_man_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/4575/6821/files/gupopisalulawipuke.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/womosoravitixugefiwil.pdf
    • https://cdn.shopify.com/s/files/1/0437/1028/3931/files/81691286730.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/99661843890.pdf
    • https://cdn.shopify.com/s/files/1/0437/5825/6286/files/xazugudetaruret.pdf
    • https://cdn.shopify.com/s/files/1/0431/0089/7440/files/agenda_and_minutes_format.pdf
    • https://cdn.shopify.com/s/files/1/0448/4674/3709/files/mail_merge_with_attachments_word_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/1297/9869/files/16510325367.pdf
    • https://cdn.shopify.com/s/files/1/0433/5383/3637/files/58581968507.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0719/files/hearthstone_open_all_packs.pdf
    • https://cdn.shopify.com/s/files/1/0433/0130/6526/files/ragulapijoxazakewuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/9917/6612/files/dulapul.pdf
    • https://cdn.shopify.com/s/files/1/0433/4243/0362/files/64076548999.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_off00005df4.bin
30de7c5839df5c319342aa86bd3126e6ee3686e81144f29ce8ce39a9cbfd5248		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF4 5412 bytes
font_01_sfnt_off0000704a.bin
a9d10a890dc9b9c7a92686a78333042387d5bff4ad0d7573fc083879fcd6f984		 pdf-font-stream PDF embedded font (sfnt) at offset 0x704A 10676 bytes
font_02_sfnt_off000094f0.bin
ebd679b8caa9f121ae9402beabe02a9f303e5b29e75b412dfefd66b13e2e5d6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94F0 16616 bytes

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