Malicious PDF — malware analysis report

Static analysis result for SHA-256 18807b1b7e9a0c0e…

MALICIOUS

PDF

42.1 KB Created: 2020-09-18 05:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2808e7e850533db19bf951aae3c53af7 SHA-1: 33ec3fead3d4a60691e5b3dcdad2831933f81c15 SHA-256: 18807b1b7e9a0c0e76b98b51b470be1b7c680ca5a3c75bd5e66536553a1faa37
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier 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.me/wix?keyword=steam+tractor+brands
    • http://kakika.febr-fdi.com/uploads/1/3/1/8/131857590/1203986.pdf
    • http://files.talltechteacher.com/uploads/1/3/0/7/130775970/aea8677201f45.pdf
    • http://lavadukul.tidytimeservices.com/uploads/1/3/2/6/132680981/5344373.pdf
    • http://jamaj.theopenbus.com/uploads/1/3/2/6/132683138/vamusedejagi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/5920/8604/files/41563849218.pdf
    • https://cdn.shopify.com/s/files/1/0465/2636/5854/files/libefiweripuxujos.pdf
    • https://cdn.shopify.com/s/files/1/0430/7301/1865/files/naxosotimijaratu.pdf
    • https://cdn.shopify.com/s/files/1/0450/1841/5254/files/xibuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/9339/3557/files/lujisafixegiga.pdf
    • https://cdn.shopify.com/s/files/1/0431/3733/5464/files/cfmeu_2020_calendar_vic.pdf
    • https://cdn.shopify.com/s/files/1/0430/2831/6313/files/zowipemedoguwasareliwewad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000589b.bin
04b2affb6c64f747133585509a07a487c35a9e9c1f9fdc565d2ca6ce1f9eab54
pdf-font-stream PDF embedded font (sfnt) at offset 0x589B 5036 bytes
font_01_sfnt_off00006980.bin
17f2bbaa33b81931af626f374824e83fab104a30a0b4f8d2030f74d469652111
pdf-font-stream PDF embedded font (sfnt) at offset 0x6980 10684 bytes
font_02_sfnt_off00008e0e.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0E 4324 bytes