Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a2cb3c62005a18…

MALICIOUS

PDF

39.8 KB Created: 2020-09-11 02:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 07a4702f51ddb2c96e48a4097df37029 SHA-1: 892c3d564663a1882213906b466c089d6aa1308f SHA-256: e0a2cb3c62005a18a2fbf1ddc061f8aa7e3dca0971a75a24b4fec0050ad6e853
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to disposable domains and appear to be part of a link farm. One URL, https://ttraff.link/wix?keyword=isobutyl+formate+iupac+name, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lure users to malicious infrastructure, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.link/wix?keyword=isobutyl+formate+iupac+name In PDF document text
    • http://karuvep.rideguide45.com/uploads/1/3/0/7/130775897/352c23d3.pdfIn PDF document text
    • http://files.ahmotivation.com/uploads/1/3/0/8/130814343/56ec426c43.pdfIn PDF document text
    • http://files.monosdoa.com/uploads/1/3/1/4/131454158/tumabirumez.pdfIn PDF document text
    • http://kadodevi.adelantechc.org/uploads/1/3/2/6/132682878/siwiruba-lebuduj-bunibuzowiwo-vofuxa.pdfIn PDF document text
    • http://files.poulsborvspecials.com/uploads/1/3/0/7/130739214/tevajikojolixa-mezoze-buwut.pdfIn PDF document text
    • http://files.ayurvedalifescience.com/uploads/1/3/1/4/131453725/914070.pdfIn PDF document text
    • http://files.lotekstreetart.com/uploads/1/3/1/4/131437005/8e33656644c2.pdfIn PDF document text
    • http://files.beltiebees.com/uploads/1/3/1/6/131636745/c66aca718.pdfIn PDF document text
    • http://files.oclegalnews.com/uploads/1/3/1/6/131636954/bofomodibu-nobem.pdfIn PDF document text
    • http://files.kxcentre.com/uploads/1/3/2/7/132710748/podebidupoforebuv.pdfIn PDF document text
    • http://kodanopo.papaesherhigh.com/uploads/1/3/0/7/130775374/tabimu.pdfIn PDF document text
    • http://files.librarianlevenson.com/uploads/1/3/1/4/131453793/liwugip.pdfIn PDF document text
    • http://rigoz.rosplumley.com/uploads/1/3/1/4/131407233/vudasekuzunu_sovuvovojimago_buvigaxu_ralen.pdfIn PDF document text
    • http://widubinu.nationalscholarfoundation.org/uploads/1/3/2/8/132814930/1963648.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/5ea4d5_9944268213fd4e9bb9d15dc891f2c6b9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/756799_5957521e0d7941d384e41779ee644cdf.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7baf93_ce02e60808e24f4eb6590bcb0a076e62.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b41a9a_9e577ef3cdc54f41b40cbf0efe012b63.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74AD 5340 bytes
SHA-256: de8b978ade11d1be76eb12ba8619fa10b8fb0754a72c7bb0cc7c10c1d86abaf0

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