Malicious PDF — malware analysis report

Static analysis result for SHA-256 112c1f89490c7928…

MALICIOUS

PDF

58.3 KB Created: 2020-08-15 12:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 012e2e83a232ba50c9dc9e08d9d3be40 SHA-1: 2456a9ecf6e6541e8e5aecd1e6531c03b95532ce SHA-256: 112c1f89490c7928abdc30096c39ea8ef3c532e9b77dac04e327e5f3d93b3981
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing for a 'PDF_MALICIOUS_REDIRECTOR_LINK' pointing to 'https://ttraff.com/wb?keyword=velaric%20airstream%20mechanism%20pdf'. Another heuristic identified a 'PDF_SEO_LINK_FARM' with many external PDF links, suggesting an attempt to manipulate search engine results or direct users to malicious content. The ML classifier also flagged the PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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/wb?keyword=velaric%20airstream%20mechanism%20pdf
    • http://files.corinnecook.me/uploads/1/3/1/1/131163953/fifovezobobudu.pdf
    • http://files.ezellaviation.com/uploads/1/3/1/4/131406149/14997da3.pdf
    • http://files.auroraarearetiredteachersassociation.org/uploads/1/3/0/8/130874514/8e0f76fbfb90320.pdf
    • http://files.mrwilliams1776.org/uploads/1/3/0/8/130874281/xikodixolo_kuguxig_moxerenazo.pdf
    • http://files.oursaviorsdevilslake.org/uploads/1/3/1/4/131452799/fe032d5c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8309/4434/files/xadoloxiderivugidiwide.pdf
    • https://cdn.shopify.com/s/files/1/0432/2269/6096/files/98693892540.pdf
    • https://cdn.shopify.com/s/files/1/0428/8095/8617/files/godizabalunuxakukoli.pdf
    • https://cdn.shopify.com/s/files/1/0428/1414/4675/files/adverbs_worksheet_3rd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0439/8238/9406/files/43974013661.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/betuki.pdf
    • https://cdn.shopify.com/s/files/1/0431/0201/1548/files/93134823225.pdf
    • https://cdn.shopify.com/s/files/1/0428/9072/3487/files/sekafujujigibekugaxes.pdf
    • https://cdn.shopify.com/s/files/1/0432/6067/4198/files/rogakaxejotef.pdf
    • https://cdn.shopify.com/s/files/1/0448/3586/4736/files/adobe_2019_crack.pdf
    • https://cdn.shopify.com/s/files/1/0427/9150/1990/files/maxonolugunepurek.pdf
    • https://cdn.shopify.com/s/files/1/0428/8564/4447/files/1611271051.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_off0000894e.bin
1e55a541fd62a4182b1c67682bd1befccd7c4c34eb12e492967f3847e05998b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x894E 5360 bytes
font_01_sfnt_off00009b5e.bin
623d34f4356d913607502991544212ff50c03a50823d271aabdaac9bc223f6db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B5E 12872 bytes
font_02_sfnt_off0000c687.bin
e462b1d3447dd7824e86a6c4ec2bf3c4148dbe95206cb0714d177a4459007af8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC687 16180 bytes

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