Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c182be33926f3f…

MALICIOUS

PDF

44.5 KB Created: 2020-07-20 02:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0fcbc95b7b17fc949898d5f59e1b002 SHA-1: 1fd5533185c2529e8c0cb935cf707652bf6b5a3c SHA-256: b4c182be33926f3f7ad473d87ecbcb33bf06a5a3ee1ebe469d4512930fe9f18d
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains a large number of embedded links pointing to various domains, forming a link farm. One of the primary links redirects to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its lure, but the extensive link farm and redirector strongly suggest an intent to lead the user to malicious content.

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.ru/wb?keyword=operators%20in%20programming%20pdf
    • http://files.flyinktattooparlor.com/uploads/1/3/1/3/131379999/jilokonedun_gunim_gusuvevavuk.pdf
    • http://files.asisproperties.com/uploads/1/3/1/4/131438155/fosujex.pdf
    • http://files.neighborhoodhousenursery.org/uploads/1/3/0/7/130739837/vovuziw.pdf
    • http://files.saraarnoldbooks.com/uploads/1/3/0/8/130815437/sofodo_galiduguwuzox_nimetonudufo.pdf
    • http://files.quixotecommunities.org/uploads/1/3/1/6/131606003/rumokigibo.pdf
    • http://files.thebohemianphoenix.com/uploads/1/3/2/6/132695805/7630269.pdf
    • http://files.gavinroypresents.com/uploads/1/3/1/0/131070207/lepiwukirup.pdf
    • http://files.kappasigmamu.com/uploads/1/3/2/7/132710575/gakumibago.pdf
    • http://files.billyreynolds.com/uploads/1/3/1/8/131871907/dedujip.pdf
    • http://files.kappasigmamu
    • https://zezisid.files.wordpress.com/2020/07/bufakom.pdf
    • https://tofosigon.files.wordpress.com/2020/06/suwusasetoninekumaxex.pdf
    • https://zowigin.files.wordpress.com/2020/07/41930468034.pdf
    • https://cdn.shopify.com/s/files/1/0428/9688/3868/files/xidinekatavefowiguvagegu.pdf
    • https://cdn.shopify.com/s/files/1/0427/3831/9527/files/71006567366.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/29269007209.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5901/files/94292161254.pdf
    • https://cdn.shopify.com/s/files/1/0431/8671/6830/files/82369750286.pdf
    • https://cdn.shopify.com/s/files/1/0433/0940/0214/files/donebajedexikupetinipufo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2862/7099/files/63529404918.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/gidimiwuditetuv.pdf
    • https://cdn.shopify.com/s/files/1/0429/0235/6127/files/diragupuzivimiw.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_off0000703d.bin
5a497a64cd8e606612b7026e435eff6c676c08b2a52ffe5d4b4c91eb860e5237
pdf-font-stream PDF embedded font (sfnt) at offset 0x703D 5144 bytes
font_01_sfnt_off0000819f.bin
14a04113b611604482aaab32fd3811c4dd7c864d83af58539d6b473a9f92ce54
pdf-font-stream PDF embedded font (sfnt) at offset 0x819F 10272 bytes