Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d37b79bf78c9c7…

MALICIOUS

PDF

40.0 KB Created: 2020-08-04 01:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b9959eec6efc8647d7279b732265625 SHA-1: 4e829a7b42d1554b84e8914040659f43cad20919 SHA-256: 12d37b79bf78c9c78b79cef407d108414437db418bcb59e15e54a4e772c063c3
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector link, indicating an attempt to drive traffic to malicious sites under the guise of providing a free book download. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests a SEO poisoning or link farm tactic. No scripts were extracted, but the PDF structure itself is designed to trick users into clicking malicious URLs.

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=the+celestine+prophecy+pdf+free+download
    • http://files.brian-connor.com/uploads/1/3/1/3/131397981/26b4761dda75.pdf
    • http://files.viewsonbrews.com/uploads/1/3/1/8/131856212/lapavaxupavezina.pdf
    • http://files.otterpointathletics.com/uploads/1/3/2/7/132710659/daxusasonusetidufe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3184/6296/files/fufuxusagimalu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4052/9816/files/pulobodukadejutokumasibe.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/95231702326.pdf
    • https://cdn.shopify.com/s/files/1/0428/2076/3804/files/66002484837.pdf
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/votupejadilapijirolikijo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0104/files/89680488291.pdf
    • https://cdn.shopify.com/s/files/1/0439/6960/9886/files/what_is_transfer_propaganda.pdf
    • https://cdn.shopify.com/s/files/1/0432/2256/5032/files/pebesilesa.pdf
    • https://cdn.shopify.com/s/files/1/0438/8506/8456/files/bafenovobidifamufiruladom.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/vobawijod.pdf
    • https://cdn.shopify.com/s/files/1/0433/4364/2792/files/uninstall_mendeley_word_plugin.pdf
    • https://cdn.shopify.com/s/files/1/0427/4801/8855/files/metemupox.pdf
    • https://cdn.shopify.com/s/files/1/0431/7465/8216/files/xaxivenit.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_off00004972.bin
08300bfab2201ba9394858898da861b6c93d999468775f96df537fd8bf382473		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4972 5384 bytes
font_01_sfnt_off00005bd4.bin
fb8203b8614228bc25885b9e2fe18da03a68c79129491d3f278a93ee8e7fd318		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD4 9960 bytes
font_02_sfnt_off00007e0d.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E0D 16092 bytes

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