Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b4250f1253eebb…

MALICIOUS

PDF

46.3 KB Created: 2020-07-09 23:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd882d65d63ef62e13e44f356f318662 SHA-1: 91ed5c353651d35cd5bd33812ed86496ca37cdbf SHA-256: c4b4250f1253eebbce2e9635ccb1875fad22ba487d634756099b337d3eccdf58
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with many links pointing to SEO-optimized PDF files. One prominent link redirects to a known malicious infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains keywords related to educational worksheets, suggesting a lure to trick users into clicking the malicious link. No scripts were extracted, but the PDF structure and embedded links strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=graphing%20polynomial%20functions%20end%20behavior%20worksheet%20answers
    • http://files.eddyfinn.com/uploads/1/3/1/4/131406049/jetuwi_mejirijifotap_sorip_dimureledu.pdf
    • http://files.paythepeople.org/uploads/1/3/1/3/131383764/zunigewep.pdf
    • http://files.villagesbmwzclub.com/uploads/1/3/0/9/130969235/1be39e0ee0.pdf
    • http://files.tioataparadise.com/uploads/1/3/1/6/131637074/jifodol-sunifibojaz-vijifik-webuxekuxawo.pdf
    • http://files.brite-technology.com/uploads/1/3/1/4/131454501/budovezazu.pdf
    • http://files.pvrr.org/uploads/1/3/0/7/130739766/c88adedcc.pdf
    • http://files.birdsongholistic.com/uploads/1/3/2/7/132740412/1197753.pdf
    • https://sofuvono.files.wordpress.com/2020/06/tunufonilorarulemev.pdf
    • https://worilivino.files.wordpress.com/2020/06/51526935041.pdf
    • https://tikuxulopij.files.wordpress.com/2020/07/82160469692.pdf
    • https://xawuzebufo.files.wordpress.com/2020/06/xigimafobasax.pdf
    • https://feleradizige555285528.files.wordpress.com/2020/07/35355623322.pdf
    • https://fafabozum.files.wordpress.com/2020/06/31764280815.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pejuzesuloroxutebed.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/33540287451.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1369814796.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49839171509.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jokopewizemaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jufozigazagapuji.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4077026649.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007495.bin
684cc3039242cf77a4ef8fb62c6a097d00ce864fe671dcf55596a7a6c3ee8853
pdf-font-stream PDF embedded font (sfnt) at offset 0x7495 5940 bytes
font_01_sfnt_off000088b9.bin
097c24b8f9eecd831490e46a27116e77f4ebcb06d383ff695a38d57d520ee4b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x88B9 10112 bytes